Will you have a car? Even without one, you could uber over to Roger Wms Park to the glassed-in botanical gardens (cross the threshold and you're in Tahiti; the citrus trees will be in bloom by then). Then hike over to the Natural History Museum and Planetarium, then hike out the Elmwood entrance to eat at Apsaras, then uber back downtown.

Other non-uber activities: RISD museum. Hike the length of Benefit St for the architecture and stop at Prospect Park for the view.

If it's nice out, hike from downtown up Wickenden to the pedestrian bridge into India Point Park on the bay. Wander through that toward the Seekonk River reading the historical placards along the way and wind up at the brewery there at the edge of the park, then make your way from there (short walk) to Ives St and choose any of the little eateries there.

Foul weather: RISD Museum then Athenaeum then the John Hay Library at Brown. If you're into swords and armor, ask there if the AnnMarie Brown Memorial collection is open.

Enjoy your visit!