Designing and building slides going into lakes often presents interesting challenges like the one we built on Lake Champlain which was over 300' long, traversed a 38' cliff, and had to be camouflaged. The end result was visually stunning but it was also fast & fun!
I love facilitating active play with kids, adults, and everyone in between. Here's a few strategies I've used to increase the level of fun (and exercise) for our family during summer break. You don't even need a waterslide (although they're really good at setting the stage for active play).