We can always rely on funcheapSF! In celebration of Earth Day, the San Francisco Zoo will be having a “Party for the Planet” from 10 a.m. to 3 p.m. tomorrow, which includes a self-guided scavenger hunt, green-themed music and puppet performances, and a sneak preview of Disneynature's Earth. Attendees bicycling to the event will receive $2 off admission, and those who drive and recycle their electronics at the event's e-waste collection site on Herbst Road from 9 a.m. to 2 p.m. will receive one free admission per car.