Pack light if possible. It will be hot, so pack for warm weather, but also please plan on dressing somewhat conservatively (no shorts or sleeveless shirts, for example). You should also bring at least one light jacket for cold nights.
Some other things you might consider packing:
A digital camera
Your laptop (rooms come with free internet access)
An ethernet cable (required for internet access)
One set of formal clothes
Bathing suit
A towel (for swimming)
Sunscreen
Sunglasses
A hat (for sun protection)
A non-debit CREDIT CARD (Visa or Mastercard)
A watch or clock with an alarm
A notebook with pencils or pens
An electrical adaptor (so you can plug in electronic devices from U.S.)
Any medication you need
Cash for your daily expenses
A headscarf (for women) for visits to Holy SItes
