Thanks Ben, Al, Jeff. I just love it up there. The first two are above the trailhead to that leads to the bottom-up/Subway route on the Left Fork. The third is accessible from the Subway "top down" trailhead (near Wildcat Canyon), on the trail that meanders east and ends essentially at Angel's Landing from the top. It's a great point-to-point hike, so you have to arrange to get dropped off (or have a car at each end).
I've done that hike a couple of times, maybe 10-12 miles of joy, with plenty of time to get to Angel's Landing before sunset. There are camping sites along the way if you choose to spend more time.
Jeffrey, I've looked at that "island" a few times, and I'd really like to do that. I think it could be do-able; don't know whether it's forbidden. Hey, it is out west -- they're obviously a lot less burdened with regulations than we are here in NY, where they've regulated the fun out of everything.
bart