They probably saw a big island and was very happy to see land. When they got there there were Indians there. They probably encountered animals when the got there.
They are most likely good on food and maybe had a bad relationship with the natives. And they probably had a good village at the time. But when John white wanted to leave they probably had little food.
I think scenario 4 is most realistic because they had a bad relationship with them. And I think they would do it when John White left so it makes sense. And it only said cro on one tree they could of gotten attacked while writing it.