Although we own DVC, we also own a 3 bedroom at OLCC.
One thing you may need/want to know is that OLCC is now "cashless".
Everything is charged to your room card. You can pay in full the day before you leave in cash (like a cruise) but otherwise, it all the charges go on your credit card you leave on file. Everything, even the newspaper.
I've never seen tubes just laying around, unless it was after 3 pm. Otherwise, they are usually laying right next to the renters of the tubes to use during the day but I guess every stay is different. There is much to do at the resort that you can really stay onsite and have a relaxing trip.
You mention you have little children. We ate at Breezes for the first time this trip (opened last year and didn't go) and although our children are 12 and 16, we loved the dinners. Kids eat for $4.99 (I ordered off the kids menu one night too). There is a DJ, limbo contest, dancing, etc. all done in front of the open air restaurant. It is a nice, casual place to go.
Enjoy your stay, we love it there.