How cool!
Do you have an extra ticket for the Loudon race? I haven't been to a race there since 1999.
Expect a lot of slow traffic going into and coming out of the racetrack, there are only a couple of roads there since it's in the middle of the mountains.
Sightseeing ideas, maybe Mount Washington and the giant hotel there, just a bit north of Loudon.
Other sightseeing ideas, meeting other Pet Talkers, Karen can show you around Boston, Anna and Kara live in NH and you have to drive through Vermont to get there so you will have to meet me too!
I'm only a couple of hours away from Anna and Kara so if it works better to meet down there I can probably make it if you can't stop in Vermont. But you just might want to tour the Ben & Jerry's factory in Vermont on your drive back.