i prefer the strap fins with a bootie, you can use wave walkers with strap fins, i have a pair of 'cudas' that are a type of wave walker and have used them for years with my subapro jetfins and they work just fine. they will come off with the fin when i take the fin off before exiting the water where a bottie will stay on your foot.
they make a shorter bootie that only comes up to the ankle, some of my dive buddies have them and really like them, they will stay on your foot better.
i also have had trouble with full foot fins not fitting right and leaving blisters, they are good for snorkeling as long as you don't have to enter the water through coral or rocks or urchins or rays or ....well you get the idea. it's always better to have your feet covered.
i would suggest taking you own mask, fins and snorkel to FP, your own equipment will fit you better than any rental stuff will.
which islands are you going to? my wife and i want to go for our 20th annv. in a couple of years, and are still trying to pick which ones to visit.
when you get back give us all a post and let us know all about it.
hope this helps, have a great trip
God Bless,
the shark