Best Way to Spend a Monday Afternoon/Evening ?

[DCor]

Hi Guys,
I'm over in Newport with work for a few days the week after next and have been booked to fly into Cardiff on Monday lunch-time. My first meeting isn't until Tuesday morning so I'll have a free afternoon and evening to play with! It's a part of the world I don't know so any suggestions on what I should be doing or seeing? I'll have a hire car to play with too ...
Many thanks.

[DCor]

Thanks guys - the Brecon run certainly sounds like a possibility and thanks for the pub tip! I'll have to see what I can coax out of the hire pound at the airport! A walk might be great but, as you say, very weather dependant. Any good transport museums in the area I should visit?