Will your h be at work during your trip to the waterpark? If so, I don't think you need to tell him. If he will be home and watching you guys pack up and leave, you could say "taking the kids to x for a while."
And yes, let him go.
3 kids BD 12/15/13 (IDKIILY. ) Rope dropped Cirque du Soleil style D final 9-9-14 "Some people are born on 3rd base and go through life thinking they hit a triple." Barry Switzer
