I have been the recipient of 3 different sandboxes; one has a big digger attached (it has regular sand in it), one is a water/sand table (it just has blue play sand in it with little toy animals and things buried in it); now I've been given a big one that looks like a boat with a steering wheel and cover....I'm sanded out....any ideas what I can use this for? I've also been the recipient of a bunch of big Tonka trucks...so, gravel might be neat in the big boat to use with the Tonkas...however, not so nice to have to pick put of the grass come lawn mowing time