O'Brien, California is on Shasta Lake north of Redding in Shasta County.   This lakeside community enjoys spectacular water views, a lake lifestyle and something fun to do. O'Brien is home to Lake Shasta Caverns tours. Billed as the 3-in-1 bonus excursion, the visit to the caverns begins with a boat ride across Shasta Lake, a hop aboard a bus up a steep mountain incline and finally a spectacular tour with large amounts of climbing. Lake Shasta Caverns, 20359 Shasta Caverns Road, O'Brien, CA 96070 Call: 1-800-795-CAVE  www.lakeshastacaverns.com Located off Interstate Highway 5 in Northern California, O'Brien is one of the many houseboat capitol destinations for those who like to play it cool on the hot summer days that can climb to around 100 degrees and stay there for extended periods during the summer.    O'Brien area, the hub of the lake, is a small community at the base of Mount Shasta on the north Shoreline of Lake Shasta. O'Brien provides central access to all arms of Shasta Lake and though rural in nature, the area offers a wide variety of opportunities. Each marina and campground appears isolated amidst the thick oak and pine forests and the steep, rugged country. The O'Brien Area is a sharp contrast to the Lakehead Area. Although both offer similar facilities and recreation choices, each is a unique outdoor experience. At O'Brien, there are resort/marinas, a public campground, launch ramps and the Lake Shasta Caverns tours.