Atiu is an island in Southern Cook Islands. It is the third largest, third most populous, and third most visited island in the Cook Island group. It is 27km2 and has a rapidly decreasing population of 480 (2009), of which most are children and elderly.
By plane - Air Rarotonga  daily flights to Rarotonga except Sundays, and weekly flights (Wednesday) to Aitutaki. Officially there is a baggage limit of 16kg per passenger but it is not handled very strictly for tourists.
Unlike the islands of Rarotonga and Aitutaki the settlements on Atiu are central. Difficulties in accessing the coast, and the lack of protective reefs and lagoons do not make Atiu as suitable for swimming and snorkelling as these other islands. Nonetheless it is possible, and there are some very nice secluded beaches on Atiu.
Relax, have a coconut.
Walk around the island, have a coconut.
Chat with the local people, learn about their culture, have a coconut.
Have another coconut
Ask around when the next pig hunt is taking place and join.
Island Tour ($40) visit places of historical interest and learn about the daily life on a pacific island.
Kopeka Cave visit ($30) visit the cave of the Atiu swiftlet, a bird which find their way in the darkness.
Burial Cave visit ($15) see the bones of Atiu's ancestors.
Raka's Cave visit ($15) the fairy tale castle of Atiu's underworld.
visit the Atiu coffee factory ($25 / minimum 2 pers.) learn all there is to know about coffee.
Bush walk with George ($40) if you want to learn about bird life and other flora and fauna of Atiu.
Reef fishing ($25). if you want to know more about Atiu's sea creatures.
Deep sea fishing ($100) with a boat.
Seafary ($50) see the island from the other perspective.
Historical Tour ($26) Ancient and recent history of the island.
There are 3 possibilities to eat out on Atiu (2009):
the Super Brown store serves Burgers Tel. 33141.
Terangi Nui Cafe Tel.33101 Serves dinner for $25 (Book before 15:00).
Kura's Kitchen Tel.33777 Serves dinner for $25 (Book before 15:00).
Self catering is also a good option, there is a lot of local stuff growing on the island. Ask the locals where to get it, usually they give it to you. Be nice and give them something back, like something you brought from home or bake some cookies, use your imagination. Bring as much non-local stuff like butter, eggs, meat, spices,... as you need. These things are extremely expensive as they are imported by plane (to give you an idea: 12 lowest quality cage eggs cost $11.50).
Ciguatera Poisoning is something you really do not want. It is caused by reef fish collecting poison from dying corals. If you want to be sure, only eat the fillet of reef-fish, but locals say the last case on Atiu has been 12 years ago. Flying fish and ocean (game) fish are completely OK.
Stealing. Cook Islanders are raised to share almost everything naturally. Things may be borrowed (even without telling the owner) and will be returned upon request, provided you know whom to ask. It is not considered stealing in their culture. So it's best to watch out for your stuff.