While I fully agree with you, for a second there I wondered what could have been proper clothing and footwear for this type of trip. I normally wear Chaco sandals in the Summer and they seem to be sturdier and more appropriate footwear for this walk and then I thought they could melt too, so... Hiking boots? Those would possibly not melt, so maybe they would have been appropriate, but I'm not sure...
A strange game, the only winning move is not to play... You don't go to Death Valley in the boiling hot summer (I myself have been in June of many years ago and it was a chillier day)
I too sometimes check the time to see if it is realistic, since the only character with a real chance of surviving underwater is Guybrush Threepwood. It kind of looks implausible in every action movie, though