Swim with giant cuttlefish

Giant cuttlefish grow to 1½ feet long and can camouflage themselves by changing shape, skin texture and color. Once a year, in early July, they congregate for their breeding season at Stony Point in Upper Spencer Gulf Marine Park near Whyalla, South Australia. To view these fascinating sea creatures, 2-day, 1-night tours are offered on certain dates each June and July by pureSA (111 Franklin St., Adelaide, SA, 5000, Australia; phone +61 8 7226 9011, http://puresa.com.au).

The tour cost of AUD549 (near $420) per person, twin share, or AUD599, single, includes hotel; round-trip transport from Adelaide to Whyalla; hiking at Alligator Gorge in Mount Remarkable National Park; a visit to Australian Arid Lands Botanic Garden; two lunches, one dinner and Continental breakfast; marine expert and guide (six swimmers per guide in the water); wetsuits and snorkeling gear, and national park fees and licensing. No children under 12; those under 18 must be with a fare-paying adult.