I'v done most all my diving in So Cal so the jump off the back and have a nice day has been the lions share of my experience. As for sea conditions at the dive site if the boat you have a bunk on goes out and the skipper drops the hook you have a choice, dive or pass. It's your call as it will cost you the same amount. If the day is called due to weather , sea conditions then you might get a re-fund or repeat dive day. I have approached a swim step that was going from 3 ft below waterline to 3 ft above water meaning timing was REALLY important. Not the dive for less experienced divers but dam it was just a pure rush to sit behind the boat and time your run at the swim step. It was like hitting an elevator already in motion, most of those boats also had a hot tub so after your dives you could sit in the tub and have a cold one, crap diving was SO much fun in those days.