Look, it is really very simple. Just fold the map so that you can get to the red idol. Then fold it again when you are there so that you can get from there to the question mark.
What you have to understand is that the area changes as you fold the map; so your goal is to fold it so that a way to the red idol opens first, and then refold it to get from the red idol to thequestion mark.
Here, I made screenshots for you. Follow the red line.
And now for something completely different....what do I have to do for the 5th meal, the dessert?