I'd say you'll be a bit too late for the salt but what do I know. Might want to bring the 5 wt and look for some of the famous native brook trout of Maine.

Absolutely positively do not miss the opportunity to go to Freeport to the LL Bean Hunting and Fishing Store. Awesome. Don't forget to hit the outlet at the bottom of the hill as well. They often have some nice rods on clearance.