R.S.
Hi K.
Welcome to Baltimore, I'm sure you miss Texas like crazy, but I hope you'll grow to love it up here, too. I'll second Pamela's suggestion of Baltimoremommies.com - you do have to apply and be approved, but it's pretty quick. I've been a member for two years and absolutely love it. Great advice on parenting, life, activities for the kids - and lots of events and activities both with the kids and for just mommies. There's a special section for relocation and the other moms will have plenty of suggestions for all of the things you're looking for.
I have an almost 3-year old son who I'm happy to volunteer for potential play-dates though :)
Hope to see you on baltimoremommies soon!
Rachael