A year of planning for the perfect family trip!

Give them a few kid locations and let them decide what they want to do. Give them suggestion but make it their choice so they have a vested interest.

Sort of like teaching school ;)

Please don't take that as snarky. My family just wanted to spend time together, searching out the unexpected. Some were fantastic, some not so much but they remember to this day the misfortunes, the mistakes as well as the fantastic. Most of all they remember the time spent together, it was fun!