Tips; Additional services or services not detailed in the itinerary and/or additional service information; Private services; Passenger liability equipment; Mountain or trekking shoes; Mountain or trekking clothing; Life insurance or travel assistance; Porter service (if available); Extra expenses during transportation; Transportation not detailed in the itinerary; Meals not indicated in the itinerary; Additional meals or drinks to the menu; Snacks, box-lunch or snacks; Extra or not included nights of lodging due to changes in the itinerary; Alcoholic beverages; Anything not mentioned in the program.