Japanese visitors take most of the tours in the morning. Those in the afternoon are more frequented by English speaking guests. Prices vary depending in which submarine you wish to dive. The newer Atlantis XIV has larger view ports and more comfortable seating.
Discounts from the book rate are widely available in many of the free publications you'll find around Waikiki. You can pre-book on the Atlantis Adventures website and receive a 10% discount. Combined adventures with a Navatek I cruise. The best place to check for current pricing and combination tours is the Atlantis Adventure website.
