That's my home marina. I'm on "Honey" at A-13E. Come say hello.
As for local knowledge, watch out for floating pot markers and sticks as you approach the channel...they're everywhere. The entrance channel gets very tight between a green mark (rock pile) and a spit of beach to starboard. You actually have good depth fairly close to the beach, but my gut keeps telling me I'm about to go aground. You'll have the same experience if you pass a decent size boat coming out at that point. Further in, shoal water runs along the west side of the channel, and the green bouys are often over shoal water at low tide. Don't get way over to the green side at low tide--the channel goes away in a heartbeat. Tides run about 6 feet, so if you enter on a high tide, you'll be able to relax a little.
The Norwalk Islands are one of the Sound's best boating destinations. Tons of little coves to explore. Put the big boat behind an island, and explore with the dink. Use plenty of scope on your anchor--remember the 6' tide and the associated current.
Enjoy your visit!
Brett