Some great and generous contributions as always -- makes this site one of the best.
A couple tips I will add:
+1 on the sharp hooks -- keep the sharpener on hand in a convenient location
- if you see the rod tip move -- get on it and release it from the rigger and reel until you either feel the flasher (and nothing) or the fish -- bring the flasher close so you can be 100% sure your hooks are clear and your bait/lure is behaving correctly
- check your bait/tackle at regular intervals -- if nothing has happened for 10-15 minutes, I will generally pull one rod at a time and check it for weeds or other misadventures (always leave the other rod(s) fishing) -- always hate staring at the rod tip for a long interval only to find the hook has been trailing eel grass for some undetermined period
- personally, I'm a "make a plan, stick to the plan" type of guy -- I select the area I am going to fish for the time period and stay there -- I will absolutely move around at my spot, vary depths and tackle but I try to avoid making long moves with rods out of the water (unless that's part of the plan for the day).
- if you can find them, there are some interesting programs and sites around that show you animated tides for different areas -- it's one thing to know that the tide is ebbing or flooding, but it's another to understand how the change creates back eddies and spots where the bait will get pushed to - sometimes it's hard to see these flows when you're standing in your boat right on the water, particularly if there is a chop -- an older resource is a free software program called TideView (requires very old versions of Windows - I think it's XP or older)
- don't be afraid to experiment -- new spots, new lures, depths etc... you don't always have to follow the pack -- why not try shallower water at the edge of that kelp bed while there are 20 boats fishing deeper
- as they say in Fly Fishing "Match the Hatch" -- what's in the belly of that smaller fish you caught -- needlefish, herring, squid, prawn? May not make sense to be using a large 7" herring plug, when there are schools of needlefish around.
- finally -- read this site and post in the fishing reports section when you have success or not...