I train there currently. Best bodybuilding gym in L.A. Hands down. Its a moot point anyway as you have no other choice living in the Marina. Great choice on the Marina by the way. You are in Manhattan now it looks like so you are accustomed to a high cost of living, but very few bodybuilders can afford to live and train out here by the beach for long periods of time these days. Sounds like you have money so you will enjoy yourself immensely I believe.
Bodybuilders in L.A. train at three gyms now. Gold's Venice, Powerhouse Chatsworth and Metroflex Long Beach. Your only option is Gold's. Luckily for you its also the best option. I have no problems parking, or with people there just to see the place or to be seen and not train hard. Just as many of the top bodybuilders in the world have no problem. Pakulski for example drives all the way from LaFrancois' house way out in God knows where, a couple of hours away, to prep for the Olympia @ Gold's Venice and he lives in Florida. Still the only gym I have seen two Mr. Olympias in training at the same time, Dex and Jay. They don't do this because there are better places to train out here. They do it because there is still no better place to train in the world, if you can afford it.
LMK if you have more questions.
Rex.