The last thing I need is my best crabbing spot burned!! JK. Actually, the only guys I know who crab are looking for green bait crabs although back when I lobstered and Gill netted we would bring back a 5 gallon bucket of crab claws for an old lady to pick. It's alot of work but the reward is nice.
I know that if I wanted to catch crabs with a kid I would go to the old sand and gravel pier on the driftway in Scituate.
Not a bad place to maybe catch a bass or use the state boat launch. Better be launching a kayak cause there is sure no where to park a trailer.