This Cache
The cache should be fairly easy to find. You're looking for a Film Canister, so don’t forget a pen or pencil to log your find.
About Yooden Vranx
From Wikipedia:
Yooden Vranx is the late former President of the Galaxy, the direct predecessor to Zaphod Beeblebrox. Just before his death, Yooden came to see Zaphod and presented his idea to steal the Heart of Gold. Following Yooden's suggestion, Zaphod locked out a section in each of his own brains so that no one could figure out why he ran for the presidency.
Congratulations to Dawes Scorpio and Brookomatic for the FTF!!