You can skip over the touristy t-shirt and jewelry stores easily. We took the free bus to see the in-town sites, which you can hop on/off. There's also a $2 (maybe $1) bus that goes a bit further to a state park. We also LOVED our excursion of flight-seeing and crab feast. The best crab ever!
Don't forget to keep your eyes on the skies. I saw several eagles flying around from the dock.