For personalized diving tours on a 38-foot Munson/Hammerhead boat (with a freshwater shower), call Pauline Fiene at Mike Severns Diving. She and her fellow dive masters lead trips for a maximum of 12 people, divided into two groups of six. Exploring the underwater world is educational and fun with Fiene, a biologist who has authored several spectacular marine-photography books and leads dives during coral spawning events. She’s particularly knowledgeable about nudibranchs, two of which have been named for her, Hallaxa paulinae and Hypselodoris paulinae. Twotank dives are $159, including equipment rental, or $139 if you bring all your own equipment. Experienced divers can rent underwater digital cameras ($40, including a photo CD or uploading your images to a web-hosting site) and tag along behind the pro photographers. Trips depart from Kihei Boat Ramp, 2988 S. Kihei Rd., just south of Kamaole Beach Park 3.