Minecraft TU41 Tutorial World

hey, i have searched very much and i found these and i could swear i remember almost everything from there but one key detail i remember thats very importand to me is missing. i remember there was even more forward a small island i think with a tiny beach and a tent wich im not sure abt this one but a cave next to it. the tent was blue and white i think and while exploring not too far away i was finding these towers having i think chests with each tower having 1 nautilus shell i think. in every one of them the way to that tent isnt even present, where i remember it being the way is just the place where you get the elytra so maybe im just mistaking it for another map, please help me and tell me if im mistaking it for another and if you know wich one i maybe am searching for.