Wow, planning a trip to Spain and the first thing that comes to mind is a soccer game? Umm, that is not really unique anywhere these days.
So, Madrid is a fabulous capital city, and if you think one art museum in Europe is the same as another, then you need to take a refresher course in art history. The Prado contains thousands of masterpieces, including great collections from some of the most famous Spanish artists: Velazquez, Goya, El Greco (adopted by Spain) and El Bosco (also adopted). Down the road is the Reina Sofia museum, featuring Picasso's stunning visual legacy of Guernica. But, you need to know a little about Spain's history to understand why this painting is so moving.
The Palacio Real (Royal Palace) in Madrid is gorgeous, full of room after room of astonishing decor and design. But, maybe if you have seen one palace or castle you have seen them all? Spain is so chock full of castles that many of them have now become hotels. We always go non-stop to visit as many as possible each trip. The Alcázar in Segovia is nearby to Madrid, and a great example of a medieval castle. Queen Isabella lived here for a while. Again, history lessons can make the entire travel experience more meaningful.
I would hope that teenage girls might enjoy attending a flamenco performance--two months ago when we were in Madrid at a flamenco show we met 40 young ladies from South America all celebrating their quinceañera by traveling to Spain and exploring their heritage.
Cathedrals are always high on my list, and the nearby historic cathedral of Toledo is stunning, but again, may not appeal to some tourists. Much of Spain's history is intertwined with its Catholic faith.
Many of the places where tourists want to go are very "touristy." However, there are certainly multitudes of options of remote and more quiet places to visit, but a car may be required, and some research about what you will see and do when you get there. Traveling in the Winter will also reduce the number of tourists.
Shopping is one of my favorite pastimes--this Summer I picked up several fans, a Damasquinado bracelet from Toledo (in prior years I purchased a sword); I browsed flamenco dresses (pricey), and many other items, but no soccer team t-shirts, although they are also popular. The Gran Via is the main street, full of shopping and restaurant choices, and it leads into the Plaza de España, another busy area with lots of souvenir shops. There are a variety of hotel choices, depending on your budget and walking stamina.
I always recommend that children traveling with parents learn something about the history, culture, important sights, food, and language of a country before they travel there, so they become knowledgeable visitors.
Buen viaje!
P.S. I was just in Portland, Maine last week for a business trip, and I made sure to take a photo of the restaurant up the road with the giant lobster on the top. I guess that area can be pretty "touristy" in the Summer, but it was just me and a young German couple perusing the scenery there.