We are leaving tomorrow too - I need to finish packing! Flying through LHR. We arrive in Cairo just before midnight on the 18th. Our plan is also to spend the 19th relaxing at the hotel.
As to typhoid, I don't think we need to worry. If you had the oral vaccine, it's good for 5 years. The shot is good for 2 years. Neither vaccine provides 100% protection. Cipro is the recommended drug if you do manage to contract it. (Ask me how I know......being sick in India is so NOT fun)
Typhoid is transmitted most typically through contaminated water or food. Normal rules for traveling in underdeveloped countries apply: avoid unpasteurized dairy products, raw or undercooked foods (no salad and only fruits you've peeled yourself). Don't eat food from street vendors. In any case, we are traveling with the Princess and staying at very nice places and there are no current reported outbreaks in Egypt.
Can't wait to see everone!
Mary Ellen