Places to go...
Jeddah City
Jeddah City, just west of Mecca, is a fairly large city with lots of things to do. The most interesting places to go there is the King's Fountain, Balad, Jeddah Aquarium, Silver Sands Beach, and the Floating Mosque.
Mecca
Mecca is a city with around two million people and it is considered the holy city of Islam. Mecca has many points of interest like the Kaaba, a sacred house and center of Islam, Albraj Al Bait, a government owned hotel, Masjid Al Haram, the worlds largest Mosque, and the Jamaraat Bridge, constructed in 1963, but added onto many more times.
Rub' Al Khali
Also know as the Empty Quarter, this is the biggest desert in the world and some problems come with it like expanding cities is an issue and also creates an issue with water. It is also very useful because the Saudi's go on Camel Rides in this desert and that is quite entertaining.