It was always the rule in our house that since there was a disagreement between us, it would be left up to the kids to decide if they want to go.
Theres been times when my older daughter (6 years old) has wanted to go. It's always been their choice and I've respected that.
They no longer want to go and their dad respects that.
Maybe it's crazy to leave that up to the kids but it's worked for us. Keeps the peace and it's taught our kids to use their critical thinking abilities. I've seen my older one weigh different things in her mind many times and come to very thoughtful, mature decisions.