Granola and trail mix are always yummy and good snacks for the heat because they won't melt. I like packing Fritos because they are have a lot of calories for their weight, and I'm a sucker for crunchy salty things (especially after hiking all day).
5 Hour Energies are probably a wonderful thing to bring, but I don't drink them so I can't comment on them specifically.
For larger meals, you can keep it simple and just pick up some dehydrated Mountain House type meals. They can be spiced up with some herbs/red pepper that you bring in. You can also pack in a few tortillas if you want. One of my favorite breakfasts is a Mountain House Breakfast Skillet with some of their fire roasted veggies thrown in, and put on a tortilla.
I would recommend bringing a small stove because NOTHING is better than a hot meal after backpacking. Or a hot coffee (I use Starbucks Via packets) in the morning as you watch the world wake up.
The stove doesn't have to be fancy, this cheap one from Amazon will work just fine. You can pick up a fuel canister on the island and it should hold you over for a 3 night trip. Pair with a little backpacking pot like this and you should be well set to heat up water for meals.
I'm also a big fan of bringing electrolyte supplements, especially when I know I'm going to be sweating a lot. I have also used Clif Shot Bloks, but they may melt in the heat.
For me, a day of backpacking food is something like:
Overall, for a full backpacking day I will aim for ~3,000 calories.
It's not the best or lightest, but it's a plan that works for me without having to spend too much time thinking about food. Meals can be switched around and mixed and matched, but I try to keep the calorie distribution roughly the same.