If you want the braids - or (cornrows) you need to find one of the beauty salons in the deluxe resorts and make an appointment. IIRC, Contemporary, GF, S&D and the GF have salons.
My dd's love them for vacation and I do too - neat and no fuss!! We usually make an appointment here at home a day or two before we leave to have them done. Less $$ and no time wasted from our vacation (it takes a LONG time).
If your talking about the wraps - a strand or two from the hair wrapped in colorful string with beads that can be done everywhere. POP probably has a stand by the pool as do most of the parks and resorts.