Digging

The Sims
When on vacation, a Sim can rent a Metal Detector from Rental Shack Jack and go looking for buried treasure. Once you stop looking for treasure, the metal detector returns to the shack and you must rent it again if you want to keep digging. Apparently every vacation lot was built over a landfill, as you can money or souvenirs while looking for treasure.

The Sims 2
Digging is an interaction for The Sims 2, added in The Sims 2: Bon Voyage. Digging can yield unexpected treasures, maps to secret lots, geysers etc. Sims can dig in sand, dirt, or any other natural substance. Geysers sprout up out of the ground for some unlucky sims, creating puddles that lower the enviornment need, and cause weeds to sprout. Dogs can also dig holes in the yard with the addition of The Sims 2: Pets.