That's why we absolutely love The Rookie Mom's Handbook: 250 activities to do with (or without!) your baby by bloggers Whitney Moss and Heather Gibbs Flett. Their suggestions are quirky, but completely doable -- the sort of things that you'd never think of doing and then wonder "why didn't I think of that?"
Grouped by baby's age (1 month, 2 month, etc...), the activities rarely require a bunch of work or money. Some of our favorites:
#24 Join a New Moms group
#45 Practice Yoga, Baby Style
#79 Be Fearless on Fridays ("...do something that scares you, whether it's taking your baby downtown, sneaking in a shower while she's in the crib, or changing a diaper in the trunk of your car."
#110 Act Like Julie from The Love Boat ("...plan your week and write up a schedule.")
We wish we had this book during months one through six. Now, find a woman you know that's about to have a baby and give her The Rookie Mom's Handbook. Her sanity will thank you for it.