going alone, alone

"Dear Edie, I am planning to go Salsa dancing alone this weekend. This will be my first time unaccompanied by a man or even girlfriends. I was wondering if you could give me some tips and etiquette advice on how to carry myself with class yet not look too desperate to dance. I don't want anyone getting the wrong idea about my being there alone. Should I lie to them and say I'm meeting someone so I won't look so vulnerable? Also, where should I sit, at th...