Most people park and dive at the SCUBA cove and various pullouts. Of the sites we list below, all except the Ranch House and Castle Canyon can be reached from the shore. If you have a boat, the rest of the park is at your subaqueous disposal. Boat launches are spread around the lake, and you can rent boats. Water visibility is best during cool months (November to April) when it peaks at 25 to 30 feet. From May to October, increased algae growth reduces visibility to less than 10 feet. Surface water temperatures range from mid-50s in winter to mid-80s in the summer. Thermoclines occur at 30-40 feet during the winter and deeper during the summer.