I really like staying in the Bay - as its been mentioned plenty of times before, it still has a great atmosphere, but its far enough away from the mayhem of San An itself to get some peace when you need it
As for the ferry across the Bay, look on the beach for where you can hire the Jet skis from - once you see where the jet ski's park, the ferry ( not sure if this is the only one or if there are more? ) is about 50 - 75 metres further round the beach - you will easy see the jetty where the ferry noors.
Its on the beach in frond of Hotel Milord - not quite as far round as Kumharas, but not that far from it.
I would definitely recommend catching the ferry - its a lot cheaper than a taxi and its a lot cooler / comfier (sp?) than sitting on the bus - but I think they only run until midnight though