Here is, again, the first demo of my hack. Made some fixes and minor changes.
It's a short demo with 8 levels, 9 exits.
Mario's adventure on Dinosaur Land is over. Now he, Peach and Yoshi go to a tropical archipelago to spend their vacations. Bowser's Valley has been ruined since Mario defeated him. Bowser sends Kamek to search for Mario and his friends while he and his Koopa Kids rebuild the castle and make changes to the Valley.
After a long time of search, Kamek finds Mario and his friends, and tells to Bowser. After finishing his work, Bowser sends his minions to the nearest places of that archipelago and sends Kamek to steal something from Peach's Castle while she's not there.
But Mario, with an usual adventurer spirit and some curiosity, will leave his vacation castle to explore the isles of the tropics. Mario will meet Bowser during his adventure, by chance.
Read the Readme for credits and more info.
CAUTION: This hack is confirmed to break in SNES9x and bsnes with a music-related glitch triggered by a Podoboo splash.