Lisboa is a lovely city with plenty of cultural and historical sites. The must see are the castle of Belem just on the bank of river Tejo (Tagus), the monastery of st. Hieronymus and the monument of Prince Henry the navigator. Also the worl expo site is worth visiting. Lisboa has plenty of rather economical hotels/hostels and of course top 5 star luxury hotels. To dine outside can as well be cheap or expensive - depending where you decice to eat. I highly recommend a visit to Bairro Alto and may of it´s restaurants, where you can eat simple but tasty Portuguese food. And meanwhile listen to melancholic fado singing. In the summer one should try fresh, grilled sardines with a fresh glass of vinho verde - green wine.   Going around in Lisbon is rather easy and cheap. You can take a tram and have sight seeing tour. Or if in a hurry, also taxis are quite cheap. The starting fee is a little less than 2 euros.