I prefer dancing International style and use it almost all the time, but I do know some American style as well and will use that, too, but only on rare occasions. Some dances that I'd like to learn when I can include mambo, bolero, hustle, merengue, polka, argentine tango, and west coast swing. Social dancing is where I get to practice my floorcraft and avoiding collisions since that's hard to do in class where everyone's dancing the same sequence in the same way, etc. The dancing also gets me away from school and work at least one night a week which is great, because we all need a break from work at some point, and I get to meet lots of people and talk and have fun and everything. It's a great time.
Competitions are a lot of fun, too.
I found that out after my first one and decided that I enjoyed it enough to want to keep competing. So I have. Comps are basically a weekend full of nothing but ballroom dancing. The great thing about comps is getting to meet people from other schools that I normally wouldn't get to meet and dancing for the whole weekend. Sometimes they're good, sometimes not so much, but the information I pick up at them should be useful at some point, even if I can't use it right away.