I would like to ask this girl out that i recently met to go salsa dancing this Friday. What are some good fun ways to ask a girl out? thank you.

I mean, just ask her. I was met with this exact situation not too long ago, believe it or not. The girl in my situation is into ballet and so it was an easy sell, but in any case it gives her a chance to dress up a little and do something she doesn't normally do (at least it's likely she's not a salsa expert). It can be encouraging to let them know you're not that great at it, but with humor, "There's free salsa lesson at this place on Friday. I need a partner to go, though. Would you like to join? It's only my second time so I'm more or less an expert, but I'll help you get caught up!" Or something along those lines. But like I said...it doesn't matter what you say really...just ask her and if she says no, be cool about it.