The underground ruins at The Roman Baths and Pumproom are very interesting. Bath Abbey has beautiful stained glass windows. Also worth visiting are the buildings designed by John Wood and his son in the 18th century. Bath is known as the city of flowers, for its many gardens.
Quick Tips:
It is possible to visit the famous Stonehenge from Bath. For more information and images, check my Travel Notes:
http://www.geocities.com/TheTropics/4363/travnote/Best Way To Get Around:
Most of the attractions are downtown and I saw them by foot. I only needed a bus to get to and from the youth hostel.