latin dancing, martial arts and take up a musical instrument.
First, if your quest was to be interesting you may have a problem here. Every guy on this type of forum takes up these three things in order to be interesting to women.
It's far more interesting TO YOU to take up things you want to do. If it is these three activities then good. Here's a little test. Are there things that you would be willing to stay up late practising? Willing to do while sick? Things that you ALREADY read about on internet forums? If so they are probably your best bet! The inklings of a passion might already be there, expand from there.
As an aside, if you are doing one or two things to impress women that's really not a big deal. It's actually pretty practical. If you are a white guy knowing how to dance will give you alot of juice over other white guys because most of us can't. At parties we drink. How sexy is that? But don't confuse socially practical things to do with actual passions or hobbies.
Second, if you have a job, school, family, and social obligations three new hobbies are at least two too many. Again it goes with the passion thing. Find something you really care about and spend your time being the best at it that you can be.