An outstanding experience that was definitely the high point of our summer trip, and a must for nature lovers. The slough itself is a major habitat for both waterfowl and small aquatic mammals (sea lions, seals, otter). I have never seen so many pelicans in one place in my life! There were terns, egrets, and loons on summer vacation from Minnesota. Wow! The tour itself is in a state-of-the-art electric catamaran, worth the trip in itself for techies. Our guide Cindy was an experienced naturalist who provided a fascinating commentary on our experience, and was able to answer everyone's questions. Bring your best photo equipment.