Excellent eco-cruises on the Murray River and into the Coorong National Park, including lunch and guided walks. The 3.5-hour Coorong Discovery Cruise (adult/child $95/69) runs on Thursdays all year, plus Mondays and Saturdays from October to May. The six-hour Coorong Adventure Cruise ($115/80) runs on Sundays all year, plus Wednesdays from October to May. Lunch included; bookings essential.
There's also a two-hour Murray Mouth Cruise ($40/20) on Saturdays from October to May (plus Thursdays during school holidays); and one-hour jaunts around the lower Murray on the MV Maranui, a restored 1897 fantail launch ($25/15).