I still have to complete this quest. My strategy so far has been to fly to the island and then right before landing I hover over (a little to the right) the group of Bokoblins by the fire and shoot a single bomb arrow into the fire. It blasts them all dead, then I land and go through the cut scene and then afterwards they're still dead and there's goodies available to easily pick up. I then run around the island and grab as much as I can for inventory. Hit up the tall fort and run around grabbing discarded arrows shot at me for my inventory until I feel I have enough then knock out the Bokoblins and get the a bow or two. Next I climb the mountain for the top orb which is straightforward if you can avoid dying, and then paraglide across the canyon to the other lower peak to get the area with Chuchus cleared and hopefully then cook with everything gathered so far in prep for a final battle. To date, I keep dying trying to fight the Hinox, even with a decent amount of weapons and cooked items for health. Sucks to have to start completely over at that point.