Where we live, we are stuck indoors for about 8+ months out of the year, so in the spring/summer months, we are outside and doing things everyday.
For us, with me being a SAHM of 4 kids, these are some things we do in the summer: spend all day at beach/ocean (our fav!), go to lake that has a huge play park, sand/beach, miles of nature walking trails (our 2nd fav), go to parks/activities with fellow homeschool friends, go to my sisters house (who has 3 girls) for kids to play outside, go swimming at my moms apt pool, be outside in our yard all day with dh, go berry picking, take walks, go to library storytime, go to the zoo, walk downtown Bellevue and Seattle, go to waterparks, etc etc
For us though, since we live in the subburbs of Seattle, nestled between the mountains and ocean, there are endless opportunities for us to do countless things.
At her age, she will love doing whatever it is mommmy is happy doing