I knew somewhat where to go based on previous knowledge, but did look up where to go in the later stages. It does somewhat ruin the effect, as that really was what the game was designed around. It's quite fascinating reading the lore and game play hints in old issues of Nintendo Power from the eighties.
Seeing what Nintendo Power had to say about it would be very interesting, indeed! Thinking back on the state of games in the 80s, particularly ones with very cryptic secrets that were required to be discovered to finish the game (Dragon Warrior, Castlevania 2: Simon's Quest, Zelda, etc.
), I feel it was probably a marketing strategy by Nintendo to intentionally make aspects of the games nearly impossible to figure out without the aid of Nintendo Power and other Nintendo sponsored game guides of the time. Given that the internet wasn't available to freely provide this information as it is today, Nintendo certainly made a lot of additional revenue on these guides.
My siblings and I had a box of old NES guidebooks, Nintendo Power issues, and the like from 80s tucked away in my parents' attic. Might be worth dredging it out the next time I visit my parents for an extended stay...certainly would be nostalgic, at the very least!