Send the teens on single rider RnR while you're at the dance party and they should be able to ride a couple of times. TSMM will be a lot of fun for the whole family.
Also, just my two cents on the dance party… it's literally a dance party, loud and kinda dark, crowded so that it's tricky to get any pictures of your kid dancing with anyone, assuming she's forward enough to go dance with them. When I took DS3, it took him a while to warm up to feel comfortable being assertive enough to get close to a character and then it was so tricky to get a shot without some older kids standing in front of me. And I think only Annie from LE will be at the party now (
http://www.kennythepirate.com/2013/04/16/disney-jr-dance-party-at-hollywood-studios/)
DS loved it, but I just thought I'd mention it because I'd had a slightly different impression of it before we went.