Winter mountains.
Unless it's a super wealthy person that invites you to their beach house. As fun as the beach is, doing activities usually cost a lot of money. A friend's friend invited a bunch of us to his beach house. Beautiful house, 2 jetskis, a yacht, and one of those water powered hoverboards. Went to a different island with a beach all to ourselves, others scattered with the jetskis, 2 of them sharing one went missing for a long time which turned out to be super dangerous because 1 basically passed out drunk and fell off. On our way to a different island, someone was going on the jetski too fast that the guy holding onto her from behind pretty much fell off forwards while holding onto her and they pretty much did 2 front flips off the jetski. Thankfully no one got hurt.
Not only does it cost a lot to do activities like this throughout the day, but there are usually a lot of restrictions. Some jetskis don't go as fast as others. You'd also likely be brought where the tourists are.