Part of it might be school, because she gets to play on the school playground every single day so it's less fun to wake up on a saturday morning and say "let's go to a playground!"
but for years, it was such a treat, it just makes me nostalgic.
I have two girls. Josie was a climber, before she could walk she was on everything. we got her a little play kitchen, found her perched on top of it that afternoon.
We took her to her first playground as an infant I'm sure, because we were bored. I see them now - parents with one baby on a playground, trying to hold them on a slide and get some reaction. I feel for them. You have a baby and they're so cute and you love them, but you secretly can't wait until they can do something. anything. new babies are nice, but not very fun.
After she could walk we learned how playgrounds "work" a little bit. low safe little kid slides usually have easy stairs with rails up to them. big steep scary slides are on top of cargo net kinds of climbing things that a little kid can't do. So I was like oh, got it... if my kid can get up to the slide, I can let her get down it! This is brilliant. I just let her do her thing.
It also lead to some over-adventuring from my little climber that scared other parents. I'd sit there and read a book, and hear someone yell "WHO'S BABY IS THIS?" and of course, it was my baby. I'd go over and "spot" to make the other parent relax but I also knew if my two year old fell off this ladder she'd be falling into sand, and she'd already fallen off worse at my house.
Olive would have none of it. She didn't even walk until she was past 14 months old or so (Josie was 10 months and change). We had to show her how to climb ladders on playgrounds! That was SO WEIRD. Now that she's five she's the perfect age for them and has a blast. Apparently this won't last long, I've just learned.
There are still fun things for Josie: trampoline parks, water slides, gymnastics class. She's not old YET.