The one from last year- Does anyone know if it will come back? It's where we can do all sorts of activities for xp, like fishing, cooking, building sandcastles for construction, and picking coconuts for farming.

Supposedly planned for August.
I can't find a source though.

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Jinxy was here

That's quite a while from now. I think it was much earlier last time.

Last year we had events overlapping and people complained that doing one event first and then another event there was no time to actually play the game.
And now Jagex is ready to roll out the graphical update of port sarim and bring an event along with it, they cannot bring out the beach at the same time with its event.

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Jinxy was here

The beach has been live and it's supposed to end Sep 12th.