Bus routes serving San Carlos include samTrans routes 73, 260, 295, 397, KX, ECR, and FLX San Carlos route
. The samTrans web site has Maps and timetables
CalTrain operates commuter rail service up and down the Peninsula, including the San Carlos train station. They also have special service for sporting events in San Francisco, Stanford and San Jose.
To find bike lanes, check the City Bicycle Route Map (fig. 7-3) and Bike San Mateo County. 511 has a bicycle commute route planner: http://bicycling.511.org/
For recreation, here are some local hiking trail maps: