I agree with those above, that while St Paul is lovely there is usually less to do than in Minneapolis. If you’re into outdoorsy things Lake Calhoun, Minnehaha Falls and the Stone Arch Bridge area are nice. For eats, I would suggest Broder’s Pasta Bar, Punch’s Pizza, or Matt’s Bar (for the famous Juicy Lucy). If you want to try some killer cheese curds, check out Chris & Robb’s. And the Mall of America is always a sight to behold (and great for people watching). Enjoy your stay!