The detectives in your group will just love these tests of their sleuthing ability.
Secret Highway Messages
Pass out the pencils and paper, and keep your eyes peeled for official road signs. Each time you spot one, write down the first letter. When you've passed five to seven signs and have five to seven letters you're ready to crack the code. Here's how: each letter stands for a word. So the letters D, S, C, S, and A could stand for the secret message "Drive slowly, construction starts ahead." Of course, others in your family may interpret it as "Dad, stop, candy store ahead."
Two Truths and One Lie
The first person makes three statements about himself or herself. Two are true; the other is a lie. For example, you could say, "I had a dog named Puddles. My sister cut off my hair once when I was asleep. I won the school spelling bee when I was in third grade." Everybody then holds up one, two, or three fingers to show which statement they think is the lie. Reveal the answer and let the next person fib away.