I think its good that you guys hide the quests to emphasize exploration, but what other better way to do it than to implement jumping puzzles?
It would be really interesting if few maps ( or even all if you got the budget for that) could get a jumping puzzle with some small reward ( like the one in legwyn family dungeon).
Its a gameplay mechanic that explorers , like myself, love to find in those new mmos ( like guild wars2 , wildstar ,Star wars the old republic, even wow has these).
here is a video reference from another game: