Which laptops (or equivalent devices from a user's viewpoint) can survive the beach sand and the heat? That is, they should not need extra ventilation even when at high ambient temperature, their keyboards (and hinges, slots, connectors, etc. ) should tolerate a small amount of sand and drops of salty water, and their screens should be bright. Any screen diagonal between 13" and 15" would do. The device should be able to run TeXLive and a PDF viewer and have some connection to the outside world (I guess, WiFi or Bluetooth). Usage: a person should be able to do typesetting with the device while their spouse, friends, or relatives, with whom they spend their vacation, are are swimming, for example.