Aitutaki is most visited island after Rarotonga, and Air Rarotonga run day trips Monday to Saturday, which include transfers to and from your accommodation. You'll get a whirlwhind tour of the island, before boarding a traditional boat for a leisurely cruise around the crystal clear, turquoise blue lagoon which (in my opinin) is one of the wonders of the natural world. An on-board barbecue of fresh fish is also included.