This cache is a just about as easy as it gets. At least until the last 50 feet. Make sure you bring your climbing shoes. And be careful.
You are looking for a ammo-box. Please make sure you replace the cache exactly as you find it.
You might want to have a picnic while you're here. It's a very nice place and well cared for. In cooler weather, you'll need a jacket.
Warning: During the winter, you may see ice bergs along the shore. Please stay off the ice bergs. They are very dangerous. You will not need to traverse any ice bergs to reach the cache.
While you're here, you may want to find Benchmark: PM0291. It's only a short walk away.