First time exploring Providence, and while sadly was only here for one day, this was one of the…read morebiggest recommendations I got for an attraction to see. And coming through here, yeah, I can definitely see why.
The RISD Museum has a really amazing and eclectic assortment of works from many different eras and locations, and you are certain to find something here to pique your interest. In one building, I went from seeing some ancient Egyptian, Roman, or Chinese statues, to Renaissance and early-modern paintaings, Victorian and Gilded age furniture, an assortments of modern and contemporary works, plus several rotating exhibits which had some very fascinating subject matters. The entire building has a somewhat strange floorplan, but this leads you to explore, discover, and find your path through the exhibits in different ways, almost like working through a puzzle to find some hidden treasures. And if you take your time, the museum can easily eat up half a day at least.
As for a couple things to keep in mind;
Parking can be a little tricky right close to the museum itself, as there are some street spaces nearby and paid parking garages. But frankly, downtown Providence is so nice that I'd advise parking further away and enjoying a lovely walk over along the canals. Admission price is very reasonable, but Sundays are apparently free entry days (or at least was when I visited).
So yeah, if you only have a couple hours to kill in this town, the RISD Museum is very much worth a visit. Hope others can come and enjoy this amazing spot.