Hi Tom, I moved to New York when I was 25 and didn't know anyone when I got there. It took a few weeks to get to know people, but it does happen. I started playing in a bar near my apartment and met a lot of friends through that. They had a stand up night and then I got a bass playing spot with a band who hung out there and met a girl who played harp and sang, and went out with her a bit. You'll be amazed how soon you will meet people.
Enjoy yourself and don't worry - once you start to work you'll meet more people too. The pictures look great, but this is summer there! Winter is awesome if you ski or board.