My two months in Hawaii gave me a little bit of experience fishing saltwater. Here are a few things to try...
1) Use a rig similar to a carolina rig (slip sinker on the main line, connect the main line and your 7-8' leader with a swivel, and a #13 AH hook). You can use 1-3" plastic grubs, in colours such as firecracker, "obake" (ask the locals what it means), motoroil/red flake, clear/gold flake...lots of other colours as well. Just cast and retrieve it and try different retrieve speed...nothing is too fast for saltwater fish.
2) Use a pyramid sinker or a bank sinker. Depending on how much weight your rod can handle...but if you are fishing in the surf, you will need at least a 3oz lead. Attach a 3-way swivel to your mainline. On one ring, use a lighter dropper line and attach your sinker to it (if you are casting 3oz lead, you need at least 15lb mono...or else your lead will break the dropper line on the cast). On the remaining ring, add leader line that is heavier than your main line. I usually use about 9"-12" of dropper line and about the same for my leader line. Attach a circle hook to your leader line. Put on a strip of squid, octopus leg, shrimp or small reef fish. Cast out as far as you can, tighten up the line, and set your rod into a rod holder. Now you wait for a big strike from bonefish, trevally or other reef fish.
3) Lures such as Kastmaster spoons, poppers like the Mark Whites or Kaku lures, or crankbaits like Yo-Zuri and Rapala will work on predators like barracuda, trevally and other predator fish. Cast them out and retrieve with various speed and action. Again, no speed is too fast.
As for the peacock bass, you can try to fish feeder mollies or guppies under a float. You can also fish 2" white senkos like you would fish for largemouth bass. You can also cast small spinnerbaits, crankbaits or jigs for them. The peacock bass in Lake Wilson do not behave like their amazon brethen...they do not go crazy over large splashy bait. Use smaller lures but fish them fast. If that fails, then you can slow down. But always start fishing fast first.
Stan would have lots more to add...I'm just an imposter