FIAR is five in a row-sorry to drop abbreviations on you. there's actually a thread about it here - it's a comprehensive 1-year curriculum for 4-8-year olds which is based on children's literature. most books are available at most public libraries. you choose one book each week and read the book every day for five days. after you've read the story, FIAR suggests a number of different activities/discussions to do relating to the book. for instance, for Madeline, on one day we looked up France on a map (geography), another day we used our cuisinaire rods to count out 12 little girls and put them in 2 straight lines, then in groups of 3, 4, etc (math), another day we read other non-fiction books about children in France (social studies), and so on. FIAR gives more suggestions than you could use in one week, so if you don't like some you can use others. I have loved it because I don't have to plan - but if we feel like doing something different, we do. Mostly it has helped me learn how to do homeschooling - how to take dd's interest and build on it to learn about other things. there is also something called before five in a row, which is geared toward pre-schoolers. it also includes suggestions for integrating Bible studies, which may or may not be your thing. If not, you can easily skip that part, although as I mentioned in the other thread FIAR "feels" Christian to me (but not everyone agrees).
cuisinaire rods - inexpensive math manipulatives - not for children under 3 - that can be used for counting, addition, subtraction, fractions, multiplication, division, building, and who knows what else.
right now playdates aren't a problem because most of our friends are still pre-k, but in the next few years we will have to connect with more hser's.
good luck. our public library actually has fiar - you might ask yours to get it through inter-library loan so you can look before you buy (there are 3 volumes)