How do I make Preview my default instead of Adobe Reader?

Go to your Finder and select one of the Adobe documents that you want to open in preview (don't double-click, just highlight). Then click Command+I to get the info pane. Near the bottom you will see: Open With and it will show Adobe Reader. Click on the arrow and select Preview, then also on "Change All" just below:

Cheers,

GB

Jesusismine001,

In finder click on a PDF document, choose File>Get Info> and in the Info window select "Open with: "Preview," then choose "Change All..."