Enjoy your time there. It is an interesting city - we found a mix of people who were welcoming and enthusiastic that we were americans and had visited and others that seemed like they were content with finding ways to rip you off.
If you walk into a restaurant and see a menu with no prices, either leave or demand a menu with prices before you order. Many places give menus without prices to tourists and then give you an outrageous bill after you've eaten. Some places also charge for water and bread that they give you when you sit down. You didn't ask for it and it isn't on the menu anywhere, but it shows up on the bill when you're done. You need to affirmatively refuse it when you sit down.
The Strahovsky monestary at the top of the hill is worth a visit. The photo below is taken from the monestary at dusk. There is a great little brewery on the grounds and a restaurant hidden in the old wine cave named Peklo. It is an experience, but the waitstaff can be a little odd and they were one of the places on the charge for water/bread program.
