This is a summary of how to create a PDF file that has internal links. Perfect if, say, you’re creating a solitaire adventure for Tunnels & Trolls (think “Choose Your Own Adventure” kind of thing).
UPDATE: I decided to really blow this thing out and add a whole lot more detail. It’s so long it now has its own web page: http://www.ardenstoneadventures.com/writing/how_to_write_a_solo_adventure. I recommend you go there to read while I debate removing the below instructions.