I thought I read on someone's journal last year that Disney wouldn't let them do it, but I could be wrong...
I love the idea; we did a few off the beach last summer and it was really cool. It's challenging though...if the wind is going the wrong way you can end up with a problem...I could understand Disney saying no because of the potential for damages...and they're a lot bigger in real life than the pretty little ones in Tangled. At least, I haven't been able to find any little ones, and I've looked a LOT.
Please let us know if you find out from Disney...
Thanks
Brooke