Port Isaac, in Cornwall, UK, had the narrowest street in the world. "Squeeze Belly Alley", according to the Guinness Book of World Records, was less than two feet wide.
This is nowhere near that tiny, but it is a squeeze. The coordinates take you to a beach access, one of many in Myrtle Beach, but this one is fairly unique. There is NO parking here, the access way is scarce five feet wide, and it's sandwiched between the fences of two houses. The beach access almost looks like an afterthought.
Terrain is rated a 2 due to the parking difficulty; nearest place I found is just shy of a quarter mile away - not the next beach access, but the one after that. Safest and simplest way would be to go up the beach, but if you can't handle walking on soft sand, you can take the sidewalk. Stealth is a must, since there are houses on either side of the beach access and people do come through here.