I had a great time there and filled 3 days easily. The Museum of Islamic Art is a must and it's just spectacular, inside and out. IM Pei did a beautiful job with the design, and the top of the building was made to resemble a falcon, NOT an Arab woman, as some will tell you. The exhibits are beautifully and dramatically presented so make sure you visit this museum. I bought a multi museum pass but only made it to one other, the National Museum of Qatar, which is also an incredible building and designed by Jean Nouvel and built to resemble a desert rose. The exhibits themselves however, were not so interesting, at least for me. Qatar has a short history. One evening, I went to the Souq Waqif, which was touristy but also there were many locals there so, it's not strictly a tourist attraction, but a real working souq. I stopped by the falcon souq briefly also. Another day, I did a 4 hr dune bashing(without the actual bashing part) tour of the Inland Sea, where the Arabian Sea meets the desert dunes, and it was lovely. It was VERY hot when I was there but still enjoyable. My last day was spent seeing some mosques, and Katara, though a couple of the mosques I wanted to visit were not open. The Education City mosque is ultra modern and the one I most wanted to see, but could only visit the outer parts. I could have spent more time visiting some galleries and if the weather had been cooler, it would have been a bit easier to just people watch at a cafe, etc. It's a unique place.