San Francisco’s students are being encouraged to hop onto a bicycle and ride to school as a way to get healthy, have fun and promote alternative modes of transportation. On April 15, the San Francisco Bicycle Coalition will host the second annual Bike to School Day. Last year, around 500 students attending 25 San Francisco schools participated in the event, the coalition said. “This year we hope that 1000 students will join us along with parents on ‘Bike Trains’ to and from their schools this year,” organizers said.