Totally depends on what you like! Hiking? Arts? Shopping? Food? There's lots around, so narrowing it down helps =) Also, of course, budget levels.
Personally I'm all about nature and food. So I recommend:
Forest Park, council crest is a fun hike
Coffee: heart, coava, case study
Donuts: blue star, Pip's
Burgers: dick's burgers, tilt
Food carts: nong's khao man gai (get the chicken skin if you're there early enough!), frying scotsman, el taco yucateco, 808 grinds
Misc: The ReBuild Center in Mississippi neighborhood, Lodeka bus, Collage stationary, the zoo is pretty cool but super busy on nice days/the weekends/summer