*cough* Oops. I thought you meant ice skating.

Bike helmet laws vary per state. I know Michigan (The state I live in) requiers helmats, I'm pretty sure New Hampshire does not. It would all depend on what part of the country you go see. Skating laws probably would also vary per state, but I don't know about them.

Now the enforcment of those laws is poor, I see people riding all the time without a helment and I've never heard of one of them fined, but you are probably better off not going that way.