ATMs are widely available. Credit cards are increasingly widely accepted. There is a major shortage of small change; large bills can be difficult to break.
Always keep small change as baksheesh is expected everywhere. When in doubt, tip.
Cafes Leave LE5 to LE10.
Guards at tourist sites LE5 to LE20.
Metered taxis Round off the fare or offer around 5% extra, depending on the ride.
Mosque attendant Leave LE5 to LE10 for shoe covers, more if you climb a minaret or have some guiding.
Restaurants For good service leave 10%; in smart places leave 15%.