It's been my understanding that products with higher percentages of DEET don't repel insects any better, it just lasts longer. So, what you use should depend on how long you'll be out and about. The really strong preparations will ruin the finish on jewelry and other such things, so be careful how you use it.
We did notice some mosquitos on our trip a couple of weeks ago. They certainly weren't awful, not as many as sitting on our deck at home during the summer. I noticed several of the beach bars had cans of OFF on the counter for customer use.