Question: is tipping customary in guam?
Answer: Tipping in Guam is pretty common since it is a US territory. ... Restaurants: If service isn't already included then you should tip about 10-15% based on the service. Bars: You should tip the bar staff about 10% or the total bill. Other: You should tip the boat staff about $5-10 per trip and the spa staff $5-10 per visit.