Felsengeggi: Thanks for everyone visiting this slightly weird and definitely hard mystery cache! I hope that those who solved it had fun and were reminded of the good old times.
To anyone who tried but did not solve it: You'd have come across smileys' image attributes, a scytale, weird domain typos, Icelandic riddles, paletable GIFs, musical one-way roads, and flimsy handywork from the 1970s. Eventually you'd have received a hint from a chipmunk and an Out-of-office mail from a snotty psychiatrist (or so). So maybe you should be glad you didn't get there...
Have a nice life!