As others said, rinse all gear with fresh water after each use. This especially applies to paddles–take them apart before rinsing and get the inside of the shaft, including the ferrules. If you don’t do this, the paddle can become extremely difficult to take apart. Besides, you want to remove any sand as well as salt. It is also important to rinse neoprene skirts, booties, and clothing thoroughly. It will require more than a quick spraydown. The rands are near impossible to fully desalt without long soaking, but you don’t need to do that to get most of the gear clean enough to dry well. Make sure to hang them up for drying.
Salt water residue on the skin feels itchy, to me. I always loved taking a hot shower soon after paddling, whenever possible. Sometimes a dip in a creek has to substitute, and that isn’t always possible. YMMV as to physical reactions. I also developed a severe chafe zone at the neck gasket, which had never happened in fresh water. This is one reason I came to prefer wearing a wetsuit instead of a drysuit.
Although you said you do not need to concern yourself with tidal currents, I still think it is a good idea to start actively learning about them. If you have the opportunity, take a class, look at what resources your instructors use to figure out timing, ask them questions, etc. There is more involved than tide heights.
Federal law requires staying a certain distance away from marine mammals. I think it is 500 feet? Something like that. The trouble is, sometimes they come to you. When that happened, I didn’t sweat the distance requirement. Where I lived, they were somewhat accustomed to seeing people in boats yet not tame. But DO NOT TRY TO APPROACH THEM. In some places, they practically live on top of buoys or docks, so nobody cares if you have to get closer to them than 500 feet, least of all them. Young seals, especially, often swim very close to you and check you out.
The marine mammals and the tidal currents are two of the major joys of “sea” kayaking! I know I will always miss having had those as part of my regular paddling.