In May, we brought 36in. inflatable swim tubes for the kids to use at CBR. (Got them from Target for $2.99 each).
The lifeguards didn't have any problems with the kids using them at the main pool. When we got there, I asked the guard if we could use them before I had DH blow them up. The guard looked at me as if I was crazy for even asking him & said "Sure". I did notice that my DD11 & DS8 were the only ones with swim tubes. I don't think any other families thought to bring them. All the other kids were using noodles purchased from the gift shop there.
Ours weren't clear...Target has pink, green, & blue ones.