-- the page you took from the rawhide toy (called "Chart" in inventory) tells you that the treasure is in the ice caves. Magnus also says that to find it, you'll need to find Captain Lawrence's journal, which he divided into parts and hid all over town.
Hint 3
In fact, you need to find three journal sections and a separate page that gives specific directions. That last page is found in the flower puzzle in the lighthouse.
When you have all the journal sections, Nancy will tell you that the journal is complete. Take a moment to read it through, and then it's time to go get us some treasure.