Mariemont is pretty. It has a small-town feel but not far from downtown Cincy. Things to do with kids? The Museum Center will be close to you & they have a huge kids' museum on the bottom floor. There are parks galore in the summer, of course. Winter is harder. A couple playgroups I can suggest: nkycincinnatimommyandme on yahoo groups and cincinnatiAP also on yahoo groups, although the latter is more of a networking group than a playgroup.
There is an elimination communication group and several LLL groups. If either of those would be helpful to you, I could dig up contact info.
Indie scene? Try heading down to Northside & the gaslight area of Clifton (near the University of Cincinnati). Sitwell's is a good coffeehouse that serves mostly local food and is kid-friendly, especially during the day. The Northside Tavern is a very comfortable bar with free indie music every weekend if you can get out for a bit. The Southgate House in Newport, KY shows a lot of good bands, again if you can get out.
Mariemont has a good theater that shows indie films -- the other is in Clifton called "The Esquire." When summer comes, check out Findlay Market downtown. You'll probably like that quite a bit.
Typically, connecting through playgroups & homeschool groups is the easiest way to find like-minded folks around here. Hope this helps!
alivia, mama to sunshine dd (2003), snuggly dd (2009), & bonus baby (due 06/2010), homesteader, homeschooler, writer, lifelong learner