I bought my son a water splash tower, he loves playing with water outside and it's great in the summer! Any small sprinklers or sprinkler mats! A mud kitchen or toy kitchen items as they love to play and put things inside the pots
I got my daughter outdoor water / sand play, a blow up pool with a shelter and a bunch of different little toys
I’ve got a kids cleaning kit as my little is obsessed with the broom and a little slide for the backyard. Then some books and a puzzle. Not too much as he won’t really remember!