T.H.
Gosh, I guess I do remember the time immediately after my daughter's birth when I thought, what will I do with all of this extra time? :-) Back then, filled the time with exercising twice a day, thinking, and talking to friends. And maybe taking naps due to all the sleep lost at night, though DD started to sleep through the night at 7 weeks.
Let me tell you that things change soon enough! Soon this baby will be a toddler and into everything, and you will wish for those days again! Enjoy them. I have been a SAHM for 2 1/2 years now, and I really don't know what else to tell you if you will be away from work for only 1 month. It would be worthless to try to join many of the SAHM groups... Have you looked into the MeetUp.com groups? Also, I know there is an indoor baby walking group for the Twin Cities listed with the Yahoo groups, and there may be more options like that out there. Also, with a baby so young, there is really no place that you would go "for the baby", so you really need to look at your own interests. Been awhile since you've made it to the art museum, or always wanted to check out the cooking demos at Williams/Sonoma? Now's the time to do that. The month will fly by. Don't worry about it, and take care of yourself!
Congrats on the baby!
T.