No offence, but there's ABSOLUTELY NO WAY you'll be allowed into Spearmint Rhino. It's a stripper/lapdancing club dude! You'll have to be 18, if not 21, and the reason the ladies will dance with you (naked) is becuase you pay them to, probably about £50. Not to mention the ridiculous drinks prices!
If you fancy clubbing at 16, then try somewhere with slack id policies. Depending on the kind of music you like, 42nd st rarely IDs, 5th Avenue IDs but only if you look under 18, The Ritz doesn't ID... the more dodgy/seedy/crappy it is, the more likely they are to ley you in.
Good luck, and drink safe!