This Friday (Halloween) is Walk Ride Day so have some fun with it. Dress up in costume or dress up in Green and Orange and reduce your carbon BIGFoot print for the day.

Wear green, go green, be green...feel good about yourself- and get LOOT from participating sponsors (see list below)!

Find alternate transport other than your gas-powered fume-emitting car -- walk, bus, train, bike, or carpool...(yeah, it's a car, but at least you're sharing it...) Always the last Friday of every month

To become a sponsor visit For Sponsors.

For more information on Walk / Ride Days and the Green Streets Organization, visit gogreenstreets.org.

Please visit these Cambridge Walk/Ride Day Sponsors who are offering those who wear and go green on Walk/Ride days discounts, prizes, raffles, and more:

Abodeon (1731 Massachusetts Avenue, Cambridge, MA 02138Phone: (617)497-0137): 10% off any of our eco-friendly products!

Bicycle Exchange at Porter Square (2067 Massachusetts Ave., N. Cambridge, MA 02140 Phone: (617)864-1300): 10% off all accessories. Also see website for ongoing offers on other days.

Bird by Bird (1361 Cambridge Street, Inman Square, Cambridge, MA 02139 Phone: (617)491-1361): 10% discount at this urban children's boutique!

Cafe Zing! at Porter Square Books (In Porter Square Shopping Center, Cambridge, MA 02140): 10% Discount!

Cambridge Naturals (Porter Square Shopping Center, 23 White Street Cambridge, MA 02140 Phone: (617) 492-4452) Participants are invited to enter a raffle to win a gift bag!

Cartridge World Greater Boston (2032 Mass Ave., Cambridge, MA 02140 Phone: (617) 661-4657): $10 off first laser cartridge refill or $2 off first inkjet cartridge refill.

Darwins Ltd. (148 Mount Auburn Street, Harvard Square, Cambridge, MA 02138 Phone: (617)354-5233 and 1629 Cambridge Street, Cambridge, MA 02139 Phone: (617)491-2999): 10% off on all purchases for those who cycle that day, and can prove it!

Eastern Mountain Sports (Harvard Square, 1 Brattle Square, 2nd Floor, Cambridge, MA 02138 Phone: (617)864-2061 ): 15% off on all purchases! (plus, a little known secret... at EMS you can go in ANY day, say that you participated on the previous Walk/Ride Day, and get 15% off).

Francis Bane, DDS (2179 Massachusetts Ave., Cambridge, MA 02140 (practice is closed to new patients)): Extra treasure from the Treasure Chest on Walk/Ride Days to all those wearing and traveling green!

Full Moon (344 Huron Ave., Cambridge, MA 02138 Phone: (617)354-6699): Free chocolate chip cookies (with meal purchase) to the first 50 people who come in having gone green and wearing green!

The Gnomes’ blogGreenward Eco-Boutique (1776 Massachusetts Ave., Porter Square, N. Cambridge, MA 02140 Phone: (617)395-1338): 10% off on all purchases at this newly opened eco-boutique! http://greenwardshop.com/

Grendel's Den Restaurant and Bar (89 Winthrop Street, Harvard Square, Cambridge, MA 02139 Phone: (617) 491-1160): Freebie: Espresso or Cappucino with $3 min. purchase on Walk/Ride Days from 11:30 am - 6:00 PM. Discount: $1 off lunch per person (excluding express lunch items).

Gymnastic Academy of Boston (128 Smith Place, Cambridge, MA 02138 Phone: (617) 441-9700): A free "Bring-a-Friend" pass and enter raffle for Open Gym Passes.

Harvest Co-op Market (581 Massachusetts Ave., Central Square, Cambridge, MA 02139 Phone: (617)661-1580): Be entered in a raffle for a $15 gift certificate.

Healthworks Fitness Center Cambridge (Porter Square Shopping Center, 35 White Street (617) 497-4454): Free towel to use at Healthworks that day! And enter the raffle for a pedometer, water bottle, and free guest pass.

Henry Bear's Park (361 Huron Avenue, Cambridge, MA 02138 (617) 547-8424): Free grab bag prizes!

Herrell's Ice Cream (15 Dunster Street, Harvard Square 02138, (617) 497-2179): Free hot fudge topping on your ice cream!

Joie de Vivre (1792 Massachusetts Ave., Cambridge, MA 02140 Phone: (617)864-8188): 10% off on all purchases!

Made by Me (1685 Mass Ave., Cambridge, MA 02138 Phone: (617) 354-8111): People who come in that day to work will receive a very cute fridge magnet, free, to also paint.

Pemberton Farms and Garden Center (2225 Massachusetts Avenue, N. Cambridge 02140 (617)491-2244): 10% off all plants and gardening supplies.

Pizzeria Uno (22 JFK Street, Harvard Square, Cambridge 02138 (617)497-1530): Free dessert with purchase

Planet Tran (1 Broadway, Kendall Square, Cambridge, MA 02142 Phone: (888) 756 8876): Planet Tran Eco-Friendly Airport Shuttle Service will offer a discount on trips in the Boston area for Walk/Ride Day and to those reservations made on Walk/Ride Day. Simply enter the discount code: PT3822 when making a reservation online.

Porter Square Books (In Porter Square Shopping Center, Cambridge, MA 02140 Phone: (617)491-2220 ): Wear green, go green, and enter an in-store Walk/Ride Day raffle for one of Porter Square Books' popular and useful canvas bags!

Susi's (348 Huron Ave., Cambridge, MA 02138 Phone: (617)876-7874): 10% off anything green in this fun studio filled with art, gifts and classes!

TAGS Home and Hardware (29 White St., Porter Square, Cambridge, MA 02140 Phone: (617)868-7711): 10% off special "green" materials (check in store)!

The Gnomes’ blogTeddy's Shoes (548 Massachusetts Ave., Central Square, Cambridge, MA 02139 Phone: (617)547-0443): Free colorful T-shirt with a $5 min. purchase! http://www.teddyshoes.com/

Tis-tik (54 Church St., Cambridge, MA 02138 Phone: (617) 661-0900): Go green, wear green and be entered into a raffle to win a free handmade recycled bag!

Toscanini's Ice Cream (899 Main St., Cambridge, MA 02139 Phone: (617) 491-5877): Free 1/2 small scoop of ice cream!

Veggie Planet (47 Palmer St. (in Club Passim), Cambridge, MA 02139 Phone: (617) 661-1513): Raffle off a gift certificate for lunch/dinner for two!

Vintage, Etc. (1798 Massachusetts Ave., Porter Square, Cambridge, MA 02139 Phone: (617)497-1516): 10% off all purchases!

Vision House (7 JFK Street, Harvard Square, Cambridge, MA 02138 Phone: (617)661-3676): $100 off a new pair of glasses!

Wagamama's (57 JFK St., Cambaridge MA 02138 Phone: (617) 499-0930) Buy one meal get one FREE when you go green and wear green to Wagamama's!

Wainwright Bank (One Broadway, Cambridge MA Phone: (617) 498-2500; 176 Alewife Brook Parkway, Cambridge MA Phone: (617) 234-2255; One Brattle Square, Cambridge MA Phone:(617) 354-3616): Free recyclable pens, t-shirts, and re-usable shopping bags to all Walk/Ride Day participants!

Watch Shop at Porter Square (1925-B Massachusetts Ave., Porter Square, Cambridge, MA 02140 Phone: (617)491-8173): 20% off new watches!

Wellbridge Athletic Club (5 Bennett Street, Harvard Square, Cambridge, MA 02138 Phone: (617)497-1516, and ask for Melissa Murphy. Or email her at memurphy@wellbridge.com): Members get a free guest pass and can enter a fitness-related raffle!

Z Square Cafe/Restaurant + Bar (14 JFK Street, Harvard Square, Cambridge, MA 02138 Phone: (617)576-0101) Free coffee or tea with purchase!