K.M.
Ooh, this was an easy one!! Aside from Disney World, the best vacation we have ever taken was last summer to the Beaches Resort in the Turks and Caicos Islands. Awesome place, totally family oriented with something for every age group (they have kid camps and other activities for your age group), and we were treated like royalty the entire time we were there. We are already saving our money to go back. Book the entire trip through their website (beaches.com). Very easy, it's all inclusive.
Disney is a good one. Again, we booked through their website and found some great deals on accomodations. We ended up at the Contemporary Inn and it was fun.
For a long weekend, you may want to look into St. Louis. (I'm assuming Barrington is outside of Chicago??) There is a TON of stuff for kids to do and alot of it is free. They have a fabulous zoo, Science Center, Grants Farm has the clydesdale horses and there is always some sort of festival going on. It's a fun city.
I hope you get alot of good ideas - I'll be checking back on your request for other posts to see if I can get some ideas for our next vacation!!