Tunnels & Trolls, for some reason, attracts solo adventures, but here's a real gem.
Go rooting around the local insane asylum in search of a missing nobleman's son or any loot you can, ahem, liberate... it's not the most likely of places to find wealth, but you are skint.
And at long last someone has used PDF technology to good effect for a solo adventure. Read the paragraph, make your choice and CLICK on the appropriate number to go to the next paragraph. Far better than scrolling up and down the file, or even flipping pages.
Er.. 'scuse me. I've got a mental hospital to explore. See you later... hopefully :)