Saudis pay with the SAR (Saudi Rial). ATMs are widely available in Saudi Arabia. You can also pay anywhere with your credit card. Euros and US Dollars are generally accepted by the banks and exchange offices. For the most recent exchange rate, visit www.xchange.com. Of course it mainly depends on yourself how much you actually spend, but as a guideline we keep approximately € 50 to € 60 per day, which should be enough. If you want to buy souvenirs, maybe you can bring some extra. Soft drinks are around € 2 and a meal between € 10 and € 20. Tipping local guides is always encouraged. Of course this is according to your own preference.