Wow. That is a really short length of time to both stay in a hotel and see some sights! If you REALLY want to see Dubai, I'd forget the hotel and just head into town to see the sights and then return to the airport. At the most, you'll have 5 1/2 to 6 hours to see Dubai - not a lot of time and even in the city, things do close in the evening. Were it me, I'd either book a hotel at the airport (actually, within the airport) and have a relaxing time.