Nikki and Roisin in Prague at The John Lennon Peace Wall
Staying outside of the city centre is cheaper and the tram connections are very good. Climb the hill across the river for great sunset views, cheap barbecues too. Segways are a fun way to tour the city and the massages are cheap to treat your feet if you do walk yourself out. Zorbing on the river is a lot of fun. Climbing the tower on the main square is good to get perspective on the tower ( there is a lift part way ).
Across the wenslas bridge is the art and museum area. It's a lot quieter but you can also stop at the Beatles Bar and take photos of the John Lennon Wall which is all graffiti and promotes peace.