You can set a timer for a more competitive & fast paced game too.
(Oh, & I feel like I should explain the "wasp nest"on their list. Daddy found a few empty ones, we checked them & left them lying around for the girls.)
Scavenger hunts never get old. I loved doing them as a kid---& still enjoy the hunt! There are a loads of items to hunt for & multiple themes of lists you could put together.