Don't worry too much about the water either... from experience it will take ages to fill and even with loads of kettles, pans on the cooker it will still be too cold. Needs a good few days to turn into algae soup warm up.
My plan mainly includes dying quietly (sinuses) which can just as easily be done at your house. I can bring dh to do crowd control. I don't have anythibng particularly exciting to play with, just usual assortment of bath toys and a watering can.
You & a bottle of wine, after the children have gone to bed. I sat naked in our very secluded garden ( we are surrounded by fields and only a bridle way at the bottom of the garden) and a friend's DH and DS chose that moment to return something they'd borrowed 6 months previously. He still doesn't look at me properly