Indian reservations are sovereign nations. Traffic violations and accidents (for instance, hitting any free-range livestock) may bring you up before tribal, not state, jurisdiction. Alcohol is not permitted on most reservations; carrying it – whether in open or closed containers – is illegal. Consider, at all times, that you are a guest of a different culture, a different nation. Do not photograph people unless permission is requested and granted. Never interrupt ceremonies or rituals. Do not assume all people speak English (and, for that matter, don’t assume they speak none). If you are buying crafts from a roadside vendor, ask if the price is negotiable; sometimes it is, often it isn’t. Be polite, just like you would in your neighbors’ home.