Avinguda Diagonal is not dedicated mainly for tourists but it is one of the most important business and shopping areas of Barcelona (for additional information – Shopping in Barcelona). That is the reason regular guided tours are not organized on the boulevard. However if you participate in a bicycle tour or in a segway tour, it is possible that you will arrive to the avenue. Moreover, the Hop-on Hop-off Bus also visit the street (for additional information – Attractions and Tours in Barcelona).
You can also take a private tour in order to visit such interesting places as the market, the malls and many others. These sites are less touristic and are dedicated mainly for the inhabitants of the city.
This ares is well known for its multiple casinos. Torre Agbar is also close to the boulevard. In the various malls you can enjoy such attractions as movies, video games and many others.