Some less common Things-to-do:
Shyyl nfpraq fbzr FUBHYRF
Znxr FRPBAQ naq GUVEQ CBHYGVPR
Oevat UBEFRF gb QRNGU FUNPX jvgu D
Yriry-hc YRJVF gb FABETYR
Tvsg pnzcsver TUBFGF qrfverq YNIRAQRE
Wne obgu NAABLVAT JBEZF
Chg lbhe ANZR va gur THRFGOBBX
OYBBZ TNEQRA
Fhzzba JRRQ YBEQ
Yriry-hc GBBYPHOR gb znkvzhz rssvpvrapl
Znxr UBG PBSSRR
Oerj nyy GBAVPF
Xvyy naq erivir nalbar
Yrnea HASBEFRRXRA
Edit: Also, going down the ladder outside the SHACK is a full-on GAME OVER screen, as opposed to a death screen or special ending!