The most economical option is to join group sightseeing tours of Genoa, which are usually walking tours with a guide in the Old Town (by the way, Genoa's Old Town is considered the largest in Europe).
Such tours are offered by the main Tourist Information Office in Genoa. Their tours start at 10:00 every weekend at Piaza Caricamento (opposite the port) and cover almost all the main streets and squares of the city.
The approximate cost of a walking sightseeing tour in Genoa is 15 EUR for adults and 12 EUR for children and people over 65 years old.
Bus tours with City Sightseeing also start from this square — a 24-hour ticket costs 25 EUR, and a 48-hour ticket is 34 EUR; an audio guide is provided on board. You can buy a ticket on the official website of the organizers.
You can also take an individual tour of Genoa with an English guide - as a rule, such tours cost 100-160 EUR per group and last from 3 to 6 hours. The theme is the most diverse - from a walk through Orthodox Genoa to tasting trips to local wineries.
The most popular destination is the resort areas: Nice, Monaco, Portofino, Florence. Such excursions take at least a whole day, count on the amount from 200 EUR.