Jericho is the Oldest City on Planet earth. not everyday one get to visit such a place.
Therefore, make sure you make up the most out of it!
You could easily fill up a day, starting with the unbelievable nearby St.George's Monastery, and than into Jericho, to the city taken by Joshua 3200 years ago, taking the Cablecar up to Temptation Monastery, where Jesus was tempted for 40 days. than to Elisha's Spring the Herodian pools where King Herod used to take good care of both his friends and enemies...
Hisham's palace is the finest example of 7-8th century Islamic Architechture in Israel.
The Baptismal site of Jesus is a just few minutes drive, and Qumeran, where the Dead Sea Scrolls were found, is definitely a must. than you could end the day floating in the Dead Sea, and go back feeling even better!