When you go to the pools, I recommend wearing water shoes since there are a lot of rocks and seaweed. Hermit crabs are a plenty there, so the shoes help with that, too. You can't take any sand or sea life with you, including shells, so you won't need anything to that effect. Bring a camera! You will encounter a nasty smell because the seaweed washes on shore and starts to rot. You might also find crab and lobster carcasses in them. Be sure, though, to not pick up hermit crabs that are attached to things because it can rip off their limbs; I hated seeing kids going crazy with them and parents doing nothing about it. Watch where you step! You may step on a sea anemone.
This is a beautiful, peaceful area, so be sure to check it out. On a clear day, you can see Mexico.