Trail, but we went enough miles to get tuckered out. We really should've picked up the overnight permit and done the whole trail.
The blue cavern, part way up the mountain at the trailhead was pretty cool. My wife swam underneath the rock ledge to get a view of the blue light... and I was stayed on the shore while some hippie girls dropped their clothes and went swimming. My wife gave me an unhappy look when she returned... but what was I supposed to do, go swimming out there at the same time?