Searching for E-T lies in the shadow of the Stanford Dish, a San Francisco Peninsula landmark with a distinguished history of contributions to science. Rumor has it that the Dish was the primary source of data in the early days of the Berkeley-based SETI project. SETI stands for The Search for Extraterrestrial Intelligence, or, as we like to say, the Search for ET.
In your own search for E-T, you will probably start at either the Alpine Road or Stanford Avenue entrances. While there are other entrances to the Dish area, these two have the most convenient parking. The trip to the Dish and the cache site is shorter from Alpine road (a bit over a mile) than it is from Stanford Avenue (around two miles). The trails are paved, but there are steep sections. Please stay on the trail. No off-trail access is permitted in this area, presumably to prevent the public from stumbling on the UFO base hidden in the valley below the Dish. Depending on whether there has been vegetation maintenance recently, there could be a little bit of poison oak or prickly bushes in the general vicinity of the cache, so watch where you put your hands.
The cache is hidden and may require some searching to find. Patience may also be needed, because you are likely to have company. Muggle walkers frequent this area, and then there are the extraterrestrials who keep watch over activity around the Dish at all times. Be stealthy! Nice weekends are naturally the busiest, but even on a rainy weekday there will be a few of the extraterrestrials about. You can't visit after dark, either. Because of the secret alien meetings held beneath the Dish on moonlit nights, the area is open only during the day (the hours vary with the seasons).
The cache container is a 4" long, 1" diameter cylinder, with a log, pencil, and pen. There is room for a few small trade items (initially two seashells from Tahiti, a shard of a china plate found near a Bay Area ghost town, and a piece of amethyst). Please take care to rehide the cache so that it is out of sight of casual observers.