Be extremely cautious on steep terrain. Don't turn your back on the sea-rogue waves can sneak up on you. A rising tide quickly brings waves within striking distance and can leave you stranded if you aren't paying attention. If a wave takes you by surprise, hold tight to a rock until you can scramble higher. Check with guidebooks or locals about currents and hazards.
Rock crevices provide safer footing, but beware of sea urchins.
Remove the spines promptly or dissolve them with a mild acid, such as vinegar or lemon juice or, in a pinch, urine. Avoid the surf zone when seas are exceptionally rough. Beware of logs carried by waves or lying loose on the rocks. Don't eat mussels unless you're certain they are free of toxins. Don't touch jellyfish.