I explored this area early too. But, I had the thunderhelm and the froggy set already. So, it was kinda sparky and slippery, but doable. I found the final big sky Island first though, with its shrine and not much else until I unlocked the quests properly. There are so many treasure chests here though that you might be able to navigate pretty well just by sensor alone. By the way, monster fights in the rain are MUCH more fun with the thunder helm. So is fishing with lightning fruit.