For a teenager, turning 16 is a magical moment and aside from the party, something unforgettable are the trips. So here ae some things you should take into account when you want to make this gift.
Get informed regarding the guides or coordinators
They are also called chaperones, even though their job goes beyond simply taking care of the girls. In the best trips these guides become a motherly figure to support the young girls. Check that the trip has at least one coordinator for each group of 15 to 20 young girls, so they can be properly managed.
Medical travelling insurance
Nothing can spoil a trip as much as a medical misstep, aside from the budgetary complications that this can ensue, so a medical insurance is necessary. Verify that the tour offers this and, in case not, ask your travelling agency to check your options.
Take some previsions for excess luggage
Try to make a detailed list of the necessary items, to not double anything, and if a shopping tour is planned, shorten the departing luggage even more, so on the trip back there are no problems with airline restrictions.