If you're looking for a sun screen for while you're in the water, I'd recommend Bullfrog. It's waterproof.

(I've burned my scalp before, and it was bad, but when it started peeling was the worst! Here's hoping you have a great and sunburn free trip!)

Hair: Very fine, normal porous (Finally! Yay!), normal elasticity, loves high dew points.
Daily: Nature's Gate Tea Tree shampoo, GVP CB, Cure Care conditioner, aloe vera gel, Jessicurls products, Spiral Solutions products.
Monthly: Henna
As needed: John Masters Organics Sea Mist
HG Product: BioSilk Rock Hard Gelee (aka BRHG. It even has HG in the name!)
Last perm: 12/10/10
CG since: 3/9/12
Last haircut: 4/17/12
Gossamer Fringe (my blog)