Most things you probably already know...
#1 - Watch where you're stepping. Those rocks are very slippery when wet with all the algae on them. Wear studded boots if you have them. If not, I purchased a pair of diamond grip ice trekkers that work pretty well when I have my wet wading shoes on. They work really well on rocks covered with see-weed, but so do my studded boots when I'm in full wading gear. Felt soles work great on rocks that are not covered too much with algae or weeds.
#2 - Look out for waves. I usually watch the area I want to fish for 5-10 minutes just to see if a large wave will go over the rock I want to stand on and if so at what power. You don't want to get knocked down or pulled into the water. Every now and then there is a wave that's larger than all the previous ones so keep your eyes open and try to have an escape route. I always look for the place where I can step down or simply move away from the place where i'm standing if I see a large wave coming. You need to spot those before they reach you. I'm talking about fishing the ledges where you look at the open ocean, not bays obviously. It also helps if you're fishing the low tide, with the incoming tide you need to be more careful of those waves and incoming water. You don't need to be too close to water to fish it, find an elevated area (rock) to cast from and try to find a safe spot where you can land a fish even if it's short distance away. That's when you might need to get closer to water than when just casting.
Mal will probably give you some more advice since he's a pro at this game