My son is flying Sep. 21 KL1352 PRG-AMS connecting to KL0621 AMS-ATL. He'd like to take advantage of the 6 hour layover and see downtown Amsterdam. Can anyone provide any advice on the pros/cons of this plan? There should be no customs PRG-AMS as they are both Schengen. His bag I assume will be checked through to ATL since it is all on KLM. So presumably he would only need to arrive back at the airport in time to clear Security and get to the gate, maybe 2 hours? He is an adult but not an experienced traveler, so getting stuck in AMS would not be good. Appreciate any advice you can offer.