Most tours of Jaffa start off at its most famous landmark, the Turkish Clocktower Square, site of the clock tower erected in 1906 to mark the 30th anniversary of Sultan Abed-El-Hamid II as ruler of Turkey. (Similar towers were constructed simultaneously in Jerusalem, Nablus and Ramle). Four separate clocks grace the top of the tower, one on each of its sides. On the metal-barred windows and openings of the tower, the history of Jaffa has been recorded.
The Jaffa flea market is a few minutes away. Spend some time here wandering through the alleyways and rummaging through the amazing assortment of items for sale. You also might try your luck at haggling.
The Mahmoudiya Mosque, just west of the square, was named after a 19th-century ruler of Jaffa Mahmoud Abu-Nabout, who ruled the city for only 15 years. His nickname (Abu Nabout, which means "father of the billy club," or "truncheon") refers to the fact that he was never seen without a club in his hand, using it to exert his authority on anyone and everyone who would not obey his will.
In the Old City itself, at Kedumim Square, the Visitors' Center is located. A large church named after St. Peter also stands on Kedumim Square, at the northern corner. It is owned by the Franciscans and since the 17th century it has also served as a hostel for pilgrims. In the church's inner courtyard there's a statue of the French King Louis IX, who fortified Jaffa as well as Caesarea during the Crusader era. Napoleon slept in the church when he conquered Jaffa and the church proudly shows off this room to visitors.
Kedumin Square leads down to Simtat Shimon Habourskai (Simon the Tanner Alley) site of the House of Simon the Tanner. St. Peter was Simon's guest, and it was while staying here that Simon had a vision in which he was instructed to proselytize among the non Jews, too. From here, Jaffa Port is but a few steps away.