- Trick or treating for adults (and families) in teams of 1 to 5! Adventure through the wickedly decorated neighborhoods of San Carlos, finding awesome displays, and answering simple multiple choice questions about each... about 25 checkpoints on the 5k, 40 on the 10k. The start occurs just as darkness is settling in, so flashlights will be most helpful. Costumes are encouraged! After you do your tricks, return to some treats at the finish and an instant raffle.