The best tours of Lisbon are offered by Lisboasighting, Rua Pascoal de Melo 3 (tel. 21/967-08-65-36). The half-day tour of Lisbon, costing 33€ ($43), is the most popular, taking in the highlights of the Alfama and visiting the major monuments, including Jerónimos Monastery and other attractions of Bélem. It even goes over the bridge over the Tagus for a panoramic view. Both morning and afternoon tours leave daily throughout the year. Ancient Lisbon, concentrating on the Alfama, always leaves daily, costing 32€ ($42). On this tour you're taken on a guided walk of Lisbon's oldest section, among other highlights.

The most recommended tour of the environs of Lisbon is a daily full-day tour costing 79€ ($103) and taking in all the highlights, concentrating on Sintra, Cascais, and Estoril. There's also a full-day (and jampacked) tour offered daily of the highlights north of Lisbon -- Fátima, Batalha, Nazaré, and Óbidos. This tour costs 84€ ($109). Many other tours are offered that might be more suited for your desires -- check with the agency for the current agenda.