Mine is the dense biozone, i love the unique plant-life (especially the big leaves that lift you up) + the big brain rocks, also the colour scheme is the most pleasing to me and it's cool when you dig and the dirt has red and blue on different facets it makes it look shimmery.

ALSO also the winding pits I like traveling up and down them making paths on the sides (also the thrill of one wrong move, and i plummet to my doom (THOSE WALLS ARE SLIPPERY)).