We booked the very first time of the day, so we were able to enter before it was too, terribly crowded. As a result, I was able take some great photographs. Be sure to book your tickets in advance, as they were sold out when we visited. The audio guide was more than sufficient and it allows you to move at your own pace, so I would not recommend a tour. We did go up in the Passion Facade tower which gave you a nice view of the city. It was OK, but not breathtaking; not sure I would do it again for that reason. The steps going down are a bit wider than those of the Nativity Tower, however be advised that it is still very narrow. We didn't find it difficult, but the young woman in front of us was terrified during the entire descent. Sagrada Familia left us in awe! Barcelona is one of our favorite large cities...enjoy!