City Sight Seeing Open Top Buses

Whenever I visit a new city I know nothing about I always take a sight seeing tour on an open top bus — rain or shine — why?
Well the way I see it is that you have 2 options — you can either wade through endless pages of city guides and plan your itinerary like a military commander intent on conquering the city or if you’re like me you just hop on a bus a make a few mental notes of the places of interest and then go and see them at your own leisure. Taking in account that you have to find things to do and hopping on a bus is one of those things you can do.
I’m from Cardiff and I’m even been on a sight sight seeing tour here. Even though I knew pretty much everything they told me I found it entertaining and that’s the point. THe tour itself is a point of interest. So unless you’re on a seriously tight budget give it a go.