Write each clue on a strip of paper. Hide each clue at the place described by the PREVIOUS clue. Put the treasure at the final spot. Start with clue 1 in the birthday kid's hand.
Somewhere you brush before school every day
(Bathroom mirror)
Where the cold things live
(Fridge / freezer)
Something that tells you when to wake up
(Alarm clock or microwave)
The place shoes go when you come inside
(Entryway / shoe rack)
Where the books live in rows
(Bookshelf)
Something soft you sit on while watching movies
(Couch cushions)
A place where water falls if you turn a handle
(Sink or shower)
Something that spins when it's hot
(Ceiling fan)
Where dirty clothes hide
(Laundry hamper)
Where the plants drink (and the treasure waits)
(Watering can or backyard — hide treasure here)
Test-run this yourself before the party. One missed clue = ten crying kids.