We absolutely loved the Big Bus Tour! In fact, we added a second day because we enjoyed it so much. Kudos to Rene for being an awesome downtown guide. He was terrific. We also very much enjoyed Suzie and Rain on the strip tour. (Don't forget to tip your tour guides!)
I can't give this attraction 5 stars because of their relationship with Pampas Restaurant. They offer a "free lunch" combo with Pampas, but Pampas refused to honor the free lunch. They only gave us a discount. They even charged for water and then added a gratuity for lousy service. The management at Pampas is just terrible. We waited 35 minutes to be seated, even though the restaurant was almost empty. Then, the meat arrived at about 15 minute intervals. The restaurant is horrible but the bus tour is great.