fraiser island

just got back from a pretty intense 3 days camping on fraiser island. fraiser is the world's largest sand island (weirdly enough, covered in reforests and fresh water lakes) and with no paved roads, everyone takes 4WD vehicles to drive on the beach and sand tracks through the inland. the hostels in rainbow beach (one of the two launching points for fraiser) sets up people into 2 groups of 11 people each to go into 2 4WD vehicles equipped with camping gear, food for 3 days, and not much else. we had a bit of tough luck on the first day with our vehicles but managed alright! saw some absolutely beautiful lakes on fraiser (the most stunning being lake mckenzie - wow) and had a blast bouncing around in the 4WD. only downside was that in my vehicle was a group of germans who (though fluent in english) spent the whole time speaking german to each other, and a group from holland who though also fluent in english spent the whole time speaking dutch to each other. really interesting dynamic there and gives some food for thought on international etiquette. i personally think its rude to do so but maybe im being culturally insensitive (shocking for an american, huh?) to expect people to speak english all the time. i can imagine people would miss speaking their native tongue, but it does give the people around them a really bad feeling of being excluded. thoughts?