Don't do Disney (gasp, I know).
You will find yourself missing the kids too much when you see all the other kids having fun. Happened to us
Do the cruise!
Now see we were the opposite. My DH and I went to WDW for 3 days and then on a Disney cruise for 4 days. I LOVED being at Disney without the kids. Didn't miss them at all, but I also knew they were having just as much fun without us, and they were staying with an Aunt that went un checked when it came to spoiling them. lol People would ask us how we got so lucky to come without our kids. lol It was a blast, but then again we are die hard Disney junkies.