Planning a summer holiday with tennis classes for the kids sounds like a blast! Pine cliffs in the Algarve must have been a great experience. If you're looking for similar options in Europe, I'd suggest checking out La Manga Club Resort in Spain.
I've heard fantastic things about their tennis facilities and classes for children around 10 years old. Plus, Spain's sunny weather and stunning beaches make it an ideal destination for a family getaway.
When I was traveling across Europe, I relied on this platform at
https://www.dbfahrplan.com/de/ for booking train tickets. It made exploring new places a breeze, and I'm sure it'll come in handy for your upcoming adventure.