We have yet to be driven out of the jacuzzi by lightning, but we have had some great times in the jacuzzi in the rain. If it does start to lightning, and you haven't yet made friends to do "the obvious", it is a great time to grab your Game of Lifestyle card game (aka "the stupid card game" as Mr. Jones calls it!) and some other people, and get acquainted. And the "mild" set of cards could be played by non LS couples as well. Or maybe some other ice breaker game that travels easily. I would imagine the staff would let you grab a table in Aphrodite if you aren't comfortable asking people back to your room to play (cards, that is!).
We hope you have the best of weather. But to be honest, if you are gonna get rained on during vacation, there isn't a better bunch of people to get wet with anywhere!