I get the feeling there's more to this than meets the eye.....
It reminds me of last year, when I took the family to WDW. We've gone several times before, and I've gotten the planning and touring down to a science now. Seems that was a problem for my family, though...my teens decided that "commando touring" was just not something they wanted to do anymore. Of course, everyone knowing how obsessed I am with WDW, they were afraid to say anything about it...until the morning we left, and my DD17 broke down in tears and said she didn't want to go! My DS15 wasn't nearly so dramatic about it, but you could tell his heart wasn't in it either (and he LOVES Disney!). She was afraid that I was going to wake her up every morning at the crack of dawn, and drag them through the parks, even if they didn't want to go. He was afraid SHE was going to have a nervous breakdown and ruin the vacation for the whole family!
Trouble was, they were both right...it pretty much WAS what I was planning! It was a reality check, all right. My poor DD had a job working retail, was just coming off the Christmas shopping season, as well as struggling through her senior year in HS, and it really was unfair of me to make her take MY dream vacation as her own! I made a few concessions that year. Her vacation could be anything she wanted it to be...if she wanted to sleep until noon, then hang by the pool, and go to the arcades at night with her brother, then so be it. I even gave her a "spa day", with facial and pedicure. Fixed her vacation right up!
So, sit down with the family, and FIND OUT what it is that they don't like about the vacation you have planned for them. It may be easier to fix than you think!
Oh, and by the way, I went this year solo. My family DID NOT MIND!