Get creative! Treasure maps are meant to be fun so dress things up to fit with your treasure hunt theme. A playground sandbox can become a wide, foreboding desert or a
Use colors any colors you think fit to your map's theme. Traditionally maps were inked with dark inks like black, blue, red, or green inks and any combination of them, but if you are making a cuter treasure map use lighter colors. Make sure that your map is readable with the colors you use.
If you chose to use an old paper texture and feel like it's too dark and obscuring important information, you can adjust the opacity settings of the layer to lighten it up some and give a more subtle worn look.
If your landmarks aren't easily recognizable it might be a good idea to make each dash represent a unit of measurement and place the unit converter somewhere easily found like near the compass rose or at the top or bottom the screen.. (i.e. 1 dash = 5 Paces)
If you cannot avoid placing your labels over a picture and it becomes hard to read, place your landmark layer at the bottom and carefully erase around the text until it becomes legible.