Good subject. A couple more things. Always secure your lures/rigs while it's out of the water. Can't count the number of times I've almost lost an eye to a hook or sinker from a swinging, flailing tautog rig in 2-3ft shop while the person walks away to do something else. Also, always clean up after yourself. Whether it's bluefish blood or bait, know where the washdown is and learn how to use it. Keep it clean as possible all day. Nothing like chipping and scraping off dryed blood at the end of a day.
Ask ahead of time what you should bring for tackle. Most guys I know have plenty of well kept gear and prefer to keep the additional stuff to a minimum.
And most importantly, don't tell your wife or girlfriend it will only be a couple of hours!
Most fisherman are fairly psychotic and don't want to hear that you girl wants you home while your sitting on top of a pile of fish. Like Pete said, a 4 hour trip turns into all day or night thing pretty regularly. So keep your options open.