Lakes / beaches with diving platforms or similar

[HappyHolidays75]

Hi
The teens loved the lido at Zell am See with diving platforms for back flips etc.
Can anyone recommend somewhere else with fun and ideally free water activities, easily accessed from an airport?
Could be a lake or the sea.
Bonus points for great hiking nearby.
If anyone is looking for similar, I thoroughly recommend Zell am See getting there via Salzburg.
Thanks!

Achensee definitely does https://www.bergfex.com/sommer/pertisau/seen/achensee-strandbad-pertisau/

@Forgottenmyphone looks brilliant. Thank you!

Slightly off the wall, but how about the grand spas in Budapest? Széchenyi Is huge and varied, Gellert has a historic wave machine session every hour.

I’ve not been but apparently Lake Annecy does.

I was going to recommend lake Annecy for this - it definitely does have these.

Lake Bled in Slovenia has the inflatables / diving kind of thing (you pay to enter this area of the lake).