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 find boots, money, or tiki heads while looking for treasure. These items are placed in your Sim's inventory and will stay there until they come home, when they put it on the nearest avalible surface. The boots are not wearable, but all of these souveniers will accumulate their worth over time. An interaction is avalible "Remember" where the Sim will pick up the item, gather a crowd, and apparently tell the story of their vacation.

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.