I agree. I happen to be an Early Childhood Specialist, so I can tell you most experts agree, too! The most developmentally appropriate education for a three and/or four year old is LOTS of exploration through play accompanied by meaningful conversations with you and the others in the family. Read to them every day, let them engage in self-directed play, let them experience the town (construction sites, zoo, grocery store), give them chores (sorting the laundry, setting the table, etc.) and just go about the business of being a family. They will have the rest of their lives to 'do school.'
This will also give you a year or so to soak up all things homeschooling. The public library has some great books, the internet is a huge resource, and of course, come to park day.
So I basically just repeated everything 'yitlan' already said!
Enjoy this time with your kiddos,