I am so glad you asked! I'm part of a wonderful group of mom's here in Woodland called the Woodland MOMS Club. We are a 20-member strong group at the moment. Our kids range in age from infancy to 8 years old, most of them being in the age range of infancy to 4 years old.
We have at least 2 activities each week, sometimes more. I can't give any details online (privacy & safety reasons). But if you email me (just click on my name & you can send me a message through this site), then I will gladly send you our most recent newsletter along with details of how to join. It's super cheap, $25 a year, which just pays for basic expenses like the newsletter.
MOMS Club International is a large organization. Here's their website: http://www.momsclub.org/.
Also, there's a large MOPS group that meets at the University Covenant Church in Davis (www.ucov.com). It's about a 15-minute drive from Woodland, not too terrible. I'm not a part of that group yet, but plan to check it out in the Fall sometime. They meet on Monday's from 9:30 to 11:30AM, & childcare is provided. I'm not sure of their fees, but I think you pay 8 weeks at a time. Here's the MOPS link: http://www.mops.org/.
I hope this is a place to start for you. I would love for you to check out the Woodland MOMS Club - you can attend 2 events for free, just to see how you like things. Not all members attend each function, of course, & being summertime we usually have about 5 to 8 members attending - with their children of course.