Shit... I would've named it 'Slipspace', seeing as how it felt like you were flying in a ship through space. 'Michael Phelps' just seems like a very cliché name for anything marijuana related.
why dont you just name it "Kids" since you were that high off of it the first time to hear the rain make the beat of the song...i remember one of the first times i smoked i heard this random beat through nature and i still remember it to this day..just an idea though