Tom, Take your 25 out. My previous ride was a 25 and I went out a few times and it is a blast. You really get to know your boat and improve your driving skills as mentioned above.
GPS and a VHF are always handy even on the lakes. As far as safety gear, it's is all the same. If you are legal on the lakes, you will be legal on the ocean. Coastguard regs are coastguard regs. The only extra equipment you should have is a hose & quarters for the wash rack (at least in Newport). Dana is free I heard and don't know about Long Beach.
As far as your trailer is concerned, after you launch, you can swing by the wash rack and squirt it down before you head out. This should ease your mind while you are enjoying the day! When you return, back to the wash rack to rinse everything off and flush the motors. The beauty of your 496 is that it is closed cooling.
I hope this helps and look forward to running with you out on the big lake