Then check out Wilson Lake and Waconda Lake. Very good places. If you like seafood, schedule yourself to be in Mankato, KS on the First saturday of the month. Right on 36. Splurge on a motel at the Crest Vue, very nice place, and have dinner next door at the Buffalo Roam restaurant. First Saturday night of the month is Seafood. Crab Legs, various types of shrimp, etc. Very good. Other Saturdays they have fantastic prime rib. Don't go Friday nights, it's Mexican on Friday night, if you want good Mexican get in Kansas City or Denver. The last time I was at the Buffalo Roam they had some really good Art for sale on the walls by the checkout, you could get one to mail back to your wife. They weren't real super big pieces. Also pickup a tray of home made cinnamon rolls for breakfast the next day.
On the way out of town, west of Mankato near Lebanon, is the geographic center of the US.