Maps that say "Dragons Be Here ". Remember the locals know their environs better than anywhere else. So if you come across this, unless you are St. George or have a fire extinguisher handy, get out quickly. They're not fibbing about the dragons.
When you are welcomed with excessive friendliness instead of caution and then a gradual relaxation as the locals realize you are only passing through. Excessive friendliness is a good indicator that a sacrifice is needed and the locals have either run out of virgins and/or will use a passing stranger like you to appease whatever needs that rather than choose one of their own.
Flora and fauna will be similar to what is found on Earth but some of it will be magical, some of it will be downright dangerous and unless you are Fresdian, the Fairy Kingdom's expert, eat and drink nothing until you see the locals do so (and survive). Also be aware that not only good creatures like fairies exist here, there will be monsters as well.