Things to do/ days out please when staying at la Manga

[mckenzie]

Are there any tennis courts outside la Manga I’m wondering so that we don’t have to pay €29 to hire a court for 1 hour?

Any water park places, or even better, beaches with the inflatables on?

Anything recommended at all please? Anything?
TIA

La manga is so nice. Doubt there are any separate tennis courts as it is kind of in the middle of nowhere, small village a few mins away and a nice drive to cartagena :)

Thanks bimgy