As far as museums go the Delaware Art Museum is super quality. Its permanent collection focuses heavily on 18th and 19th century works and showcases many famous names. You’ll find a lot of college art students here, hunched down and sketching. My only compliant is that the contemporary/modern section is a little rushed/small. Last time I was here they were working on that section so perhaps it’s been expanded since. They’ve got a great café here too that sells gourmet sandwiches and coffees.