A tub of clear water sits at every entrance of a house in Malay kampung (village). The local culture requires everyone entering the house to take off their shoes (if any) and dip their feet in the water to wash off sand and debris. Tropical hot weather dries your feet quick, no need to worry about leaving wet marks on the wooden floor.
Ibn Battuta mentioned about similar practice in 14th century Maldives. Possibility of cultural exchange here.
Foot-bath might pose a problem if you have a small coral-cut on or under your foot. Which is quite likely if you have been in the ocean once or twice. Regular wetting of injuries slows down the healing process. Wearing adhesive bandage to keep sand/debris and water off the wound is suggested.