Double-decker buses can be completely enclosed or open-topped. Open-topped double deckers are mainly used for sightseeing tours because they provide tourists a 360-degree angle for viewing the location. Enclosed double-decker bus tours allow you the opportunity to view the city from somewhat of a bird's eye view.
Open-top double-decker tours are most beneficial in cities with high buildings, but are drawbacks in rainier climes since only the front of the upper level is shielded from the rain. Completely enclosed double-decker tours hamper visibility since you are only able to look to the left and the right. Both types of tours can be guided, either via a pre-recorded audio tape or a live tour guide.
Sit on the top level of the bus for the most promising views. Sitting at the front of the bus if you are in a city with a rainy climate will keep you drier while still giving you 360-degree views. Look for hop-on, hop-off bus tours. You will be able to see the most of the city at your own pace, and a single hop-on, hop-off ticket is normally valid for 24 hours. You can catch the bus outside of popular tourist locations whenever you want.
