So, ideally, people would attempt to live around lakes or natural water basins..
And, unless there were some means to leave individual islands, you'd be fairly isolated..
Unless the islands move in relatively stable patterns relative to each other, so that they'd be closer to each other at various times.
“She'd become a governess. It was one of the few jobs a known lady could do. And she'd taken to it well. She'd sworn that if she did indeed ever find herself dancing on rooftops with chimney sweeps she'd beat herself to death with her own umbrella.”
― Hogfather