As others have mentioned do the One Love Bus Crawl it is a blast. Lenbert will pick you up and is very prompt on the time he says he will be there. You can contact Lenbert at bananaznegril@hotmail.com and the crawl is on Wed and Fri only. It is a blast and you tip at the end of the ride (be generous)
And also get off the reservation you should be able to walk to the Office of Nature for a nice lobster meal close by but a walk down 7 mile beach is a nice experience also with plenty of places to stop grab a drink or food.