Christmas Scavenger Hunt

I`m wanting to plan a Christmas Eve Scavenger Hunt to do with my 2 married kids...so 4 of them. I inherited some money from a passing Aunt, and want to find a fun way to share some of it with them. Has anyone done one inside the house? Any suggestions? I want to give each family a different set of things to find, as I want to attach some money with each item. They`re all about riddles, too. HELP!