Big 0 is like a freakin ocean when it kicks up be careful, have a gps, cell phone, vhf radio and take it slow if it kicks up out there.. Same goes for stick marsh,, watch out for those wooden speed bumps in the marsh. In Big O, make sure when you come off plane there that you have plenty of water, most of the bottom below the muck is coral, it will snap your skeg like a toothpick. I would highly recomend getting a guide for both places before going off on your own. You will enjoy both places very much. On Big O look for clear water and pepper grass, buzz baits, plastics, like worms ( black grape ) zoom super flukes and senkos are the ticket.
Have a great trip, and stay safe..