A variety of water sports are available at Shawnee Mission Park Lake, including sailboating, canoeing, kayaking, paddle boating, fishing, and swimming (at the beach only.) No power boats allowed other than those utilizing trolling motors.
Equipment: Sailboats, paddle boats, canoes available for rent at marina.
Canlan Ice Sports is a hot spot for youth hockey, but also has many open times for pleasure or recreational skaters. Good idea to call ahead for open skate times.
It can be fun to just drop in, as I did this particular day, and watch the kids play. (And, of course, their rabid parents.)
Equipment: Skates available for rent, or bring your own.