If I could give any advice, it would be to be honest about your situation with the people you are going on vacation with. If you explain The Master Cleanse to them and the myriad of benefits that it produces, I am sure it will dispel their skepticism. I myself, have encountered people where I felt if I told them about the master cleanse, I would be faced with antagonistic views about what I was doing. I overcame any apprehension and told them about it anyway. The vast majority of the people were receptive to this new viewpoint of health, and some even began the cleanse themselves! Often we think that people will respond in certain ways but in reality they may even shock us in how they can react openly and supportively. If you approach them in a loving manner, there is no choice but for them to respond in the same way.