I had a bad experience with altitude sickness as my body wasn't adjusted to the heights of La Paz onwards.There was no time to get acclimatise as the tour starts the next day after arrival.What I would suggest is ,in future travels to these high places ,the tourists should be informed about the possible danger of altitude sickness and seek medications from doctors or pharmacists prior to the adventure.I wasn't aware of this as I certainly would take precaution before embarking on the journey.I missed 2 trips during the whole tour.On the whole the trip was still worth it except few plumbing problems in one of the hotels.It was a good trip on the whole and tour guides was good.The did a good job.