At 500 acres, 370 Lakeside Park is the largest park in St. Peters. Located off Highway 370, this sprawling park includes a 140-acre recreational lake with fishing and boating (electric trolling motors only), a 5.5-mile walking trail surrounding the lake, and an RV park.

The park also has a playground and a splashground, family picnic areas, park pavilions including a corporate pavilion with seating for up to 300 people, a sand volleyball site, an archery range and the St. Peters Rotary Club Dog Park.