Wondering if you can access Caribbean from Pop on foot (for example, getting to Caribbean before the Skyliner opened in the morning)?
Not that I’m aware of.
Theoretically possible but you would be on roads that are not intended for pedestrians.
Here’s the part where you’d get into trouble:
There is no walking path on Century Drive or Cayman Way. I would not recommend trying.
P.S. I wish there were more walking paths. It should be possible to walk between any two points in WDW, even though some of those distances are prohibitive. (It’s like 3 miles between Epcot and the TTC.)