What booties do you use over the sandals? I've had problems in that most of the booties that I've found only go over those tiny ass cycling shoes that don't fit my feet even if they are ostensibly larger than my shoe size. So what I've done in the past is wear water resistant booties over my socks but in my sandals.

Granted I've not been anywhere that had a large selection to choose from either so I can certainly believe that there's something out there. I'm just not willing to randomly buy things hoping that they'll work.