While I suppose it's possible to get to this cache without a boat (except for the ferry to get you to the island itself), you'll probably find that it will be very difficult and take hours to hike to this part of the island.
In fact, we found it relatively difficult to find a spot via dinghy that was close enough to the cache, yet safe enough to land on shore. It looks like it's easy to do from a distance, but when you get close, you'll see that there is a lot of surging going on next to some very sharp rocks. Be careful! Also, be sure to attach your dinghy securely before leaving it. There is not much you can use. We used a large rock around which we tied the painter.
There are lots of small outcroppings of cactus. Be careful, especially when going back down. The rocks are loose. We did it in boat shoes and open-toe sandles, but I recommend something more sturdy.
We put the cache a hundred feet up from the beach in case there's a major storm. It's in a very good spot!
You might want to lather up with bug spray before attempting this cache. We were eaten alive by noseeums. Sounds fun doesn't it!
The cache is a small tupperware-like container and has a small, disposable camera, a log book, a pencil, and a photograph. If the camera gets full, please mail it to us (our address is in the cache). Please leave the photograph and put one in of you (especially if the camera isn't full). If you have any questions before you go, email me. I can give you additional tips to make the stop fun!
Here's a website with more information.
Also, if some kind person would send me the log, which is now full, and replace it with another, I would be most appreciative. It can be sent to PO Box 1964, Orangevale, CA 95662.
Small note on cache maintenance: I will visit here annually, Walker Mangum will also assist with maintenance during his visits to the island.