Not quite spelunking, but an adventure nonetheless.. Reasons to Go Onandaga Cave in Leasburg has been known to inspire a poetic flight of fancy or two with its pristine rooms and dramatic stalagtites. It is a premier cave in this cave state of ours. If you are looking for something to do on a hot Sunday afternoon in summer, pack the family into the car and head west on Highway 44 to State Road H at Leasburg and Onandaga Cave State Park.
What You'll See The park is a 1,317-acre facility on the Meramec River featuring swimming, picnicking and hiking. The cave itself is a National Natural Lankmark. Tour in year-round 60-degree comfort and take in the Lily Pad Room, the Big Room, the Twins and the gigantic flowstones, the King's and Queen's Canopies. The guided trail through these natural wonders is a bit less than a mile, is well lit, and takes about an hour and 15 minutes to complete. An impressive interpretive center and a small gift shop will satisfy a family's need for more information and the requisite souveniers.