No problem in using your own gear in RR. Considering the times it would be weird if they didn’t let you.I’m not sure if this is part of what the OP is asking, but you can’t use the Rainbow Reef gear in the lagoon. I also thought I remembered you could NOT use your own gear in RR, but I could be wrong; after snorkeling around the islands, even the kids were underwhelmed (not that’s it’s not nice, it’s just very small compared to the open ocean obviously).