I've put together a list of tips and suggestions for travelers, drawing on advice from colleagues and friends. It's geared towards public health or development folks who work in and often travel between low-income countries, as opposed to backpackers, tourists, etc. The document is in Google Drive so I can continuously update it with suggestions -- feedback is appreciated. Another good resource is How to work in someone else’s country by Ruth Stark, which is written with global health consultants in mind, and contains useful packing advice and good general rules for cross-cultural work. Chris Blattman has written quite a bit about this; see especially his posts on air travel, air travel pt 2, packing, and packing pt 2.