I think all of those sound awesome. I know the weather will probably be nice so you'll want to be outside, but have you ever tried baking (cookies, bread) with her? That could be fun in the evenings. And I've started to take my D to the library on weekends- a special activity she does with mommy.
Also, for future reference- as a way to interact with more people, you could sometime try to initiate a play date with one of her friends from school on a weekend day or arrange to meet at a park- you might meet some other nice parents. Whatever happened with the single parent group you were looking at?
When the men on the chessboard Get up and tell you where to go; And you've just had some kind of mushroom And your mind is moving slow; Go ask Alice... I think she'll know.
