Just be a little cautious about shore diving. Getting into the water from the beach can be a challenge for kids. Put your mask and snorkel over your head and around your neck. Walk as far out as you can, best if you can get beyond the breakers. (not a problem at CC). Support each other as you slip on one fin at a time, sand washing into a fin can be really uncomfortable. This happens easily if the child shuffles backward, you may have to help them remove the fin, dump the sand then put it back on. Then pull the mask up onto your face. Being beyond the breakers will keep the waves from washing over your head and into the snorkel, keep your child supported above the waves, if possible. All this is one reason why it can be easier to snorkel off a boat, jumping from the dive platform, feet first with gear in place, or again, with the mask around your neck, hold your breath, then slip on the mask. Sorry, probably too much info. And don't forget, you float much better in salt water compared to pool water.
Don't worry about sea lice or jelly fish. No dive boat is going to drop you into them. And while the stings hurt, they abate pretty quickly. DS6 got stung by nematocysts after grabbing onto one of the bouys at CC ( I did, too). He howled for a bit, but we inflated his vest and held him a bit, then he was ready to go again.
Carla