Myself, the mrs and the dog went to Mersea today. We launched at west Mersea rnli as fenlander suggested - perfect launch site! We launched at low tide, I drove my navara to the water without any sinking and quickly got the boat in the water. I had to park on a side street but that was the only slight hitch.
From west Mersea we went to East Mersea, then on to brightlingsea where we pulled the boat up to let the dog stretch his little legs while we had a drink and lunch (pic from the beach), we then carried along the coast to st osyth. With a calm sea we went straight across to foulness island and had a quick look about (at a sensible distance). The boat was performing brilliantly in open water so with half a tank left we headed back up to bradwell on sea where we found loads of jet skiers, we then went across to tollesbury fleet before finally going back to west Mersea.
We reached west Mersea at high tide and used the public slip to recover the boat as the rnli slip gets a bit cramped at high water.
I would highly recommend a day out here, we are probably going to put a bit more time into planning our next outing here as we spent a lot of time blasting around flat out and not taking in the views!