I love the idea of plussing up your vacation with a little something extra each year, Pablo! I might just have to adopt that practice myself, but don't worry, I won't tell my husband that you gave me the idea.
If I had to choose just one tour, it would definitely have to be
Backstage Magic. Lasting between six and eight hours, this gem gives guests an in-depth look at what goes on, well, backstage. Spanning all four major theme parks, this tour will surely leave guests feeling like Disney VIP's. As if all that weren't enough, lunch at one of Disney's most popular restaurants is included, too!
Second to Backstage Magic, I would recommend
Around The World at Epcot. It gives guests the chance to experience the World Showcase on wheels via Segway. The Segways are really easy and intuitive to operate. That, together with the fun tidbits your tour guide passes along as you journey around the world, makes this one tour worth taking.
Both of these tours are open to guests ages 16 and over, so do keep that in mind when booking for your family. Enjoy!