Sounds pretty perfect to me as well. I love it when we go camping and it hits maybe the mid to upper 70's during the day and then drops down to the high 40's at night. Must be a midwest thing! That's pretty funny about him putting his cars in your beverages. Did it look like those things light up? It's possible they are lights maybe. Might be worth coming back at night.
Yeah, he is obsessed with the toys in liquid thing. I can see his brain light up when he is holding an object and he sees a cup full of drink.
Yeah, I think they may be lights of some kind. They must be solar or battery powered though because there are no power connectors that I could see. Good call, I will go over there later this afternoon when the sun is going down to see if that is the case. There is a bunch of other stuff there as well that seems to be in various stages of construction.
Like you said, it could be an exhibit. Remember those capsules you put in water and then they became like a foam dinosaur? If you could trust him not to eat them, he might have a blast with those. Of course you may not want to encourage that habit! ;)
Oh yeah, I bet he would love those! Good call.