For boating or swimming? For use in the pools, no. When we've taken the ferry boat from OKW to DtD, small children were supplied life vests. On rental boats, I don't know, but I would also assume small children would have them supplied.
The CR has them for swimming. You show your room key & it is yours to use for your entire stay, no charge. You must return the life jacket to the rental area before you check out of your hotel. If your children have one that they love & it is not too big to pack, bring it. Have a great vacation!
You're all correct. I haven't seen anyone use anything but floaties at the quiet pools at OKW, but there are life vests/jackets available at Hank's Rent & Return.
Yep... I know I've seen them issued at VB and HHI too. So, I would assume all the resorts have them.
Edit: Just remembered a thread from a while back... a mom mentioned while staying at VB that they let her child take a life vest down to the beach to wear. Probably not advertised, but allowed if asked for. That's my guess.