Large coastal US cities that are SAFE?

i currently live in the suburbs of detroit where whenever I go into the city for concerts, etc. I do not feel safe at all and constantly have to watch my back, although I enjoy the big city feel and nightlife. I would like to move just outside a big city preferably on the water and in the south, I really can't stand michigan winters. I've looked into fort lauderdale area around miami but wouldn't even mind the west coast. I know all big cities have their bad areas but I would like somewhere that isn't as big into crime and as dangerous as detroit, I would like somewhere where i can go out to clubs and the beach and has good nightlife since i am young. Any suggestions would be appreciated.