Off the top of my head.

Depends on what you're into if you like walking around you could do a historic walking tour, If you've never been to new England places like benefit st have alot of old houses and history.

There's parks, like prospect terrace which has a great view of the city and great sunsets, the east bay bike path if you want to be outside, but it's getting chilly.

Museums like Risd museum, Old house museums like the john brown house, and stuff like roger Williams botanical gardens are fun too.

Besides that food, lots and lots of food. So many restaurants just pick what you're in the mood for. Thayer and Downtown will have the biggest concentration of choices.