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A homemade sign informs visitors how many people have died swimming at Hanakapiai Beach on the north shore of Kauai.

Hanauma Bay requires visitors to learn about the ecosystem and the hazards of snorkeling before entering the nature preserve in southeast Oahu.

Lifeguard Josh Guerra says he rescues two to six people a day at Hanauma Bay, a mecca for Hawaii’s most deadly tourist activity: snorkeling.

Alan Hong teaches people how to snorkel at Hanauma Bay, where being male, in your 50s or 60s, and having pre-existing heart conditions are common traits among drowning victims.

A woman snorkels off the coast of Oahu. Colorful fish and expanses of coral are the attractions, but in the last 10 years, more than half of all visitors who drowned in Hawaii were snorkeling.

A lifeguard places signs warning of rip currents and unsafe swimming at the Banzai Pipeline on Oahu’s north shore.

A stretch of Oahu’s Sandy Beach is particularly treacherous — one of the worst locations for spinal cord injuries in Hawaii.

Lifeguards frequently warn visitors, including this pair, about the dangerous waves and shore break at Sandy Beach.

Beachgoers watch the large surf at the Banzai Pipeline. Winter waves are sometimes so epic you’d think the hazards are obvious, but lifeguards issue plenty of warnings anyway.

Ignoring signs warning people to stay behind a fence, visitors climb the cliffs at Oahu’s Halona Blowhole.

Youths seem to be imitating mountain goats as they pause on precarious perches above the Halona Blowhole — one of the places with the highest number of tourist deaths over the past four years.

The view from atop Hanauma Bay, using a tilt-shift lens.

Human remains in a cardboard box await cremation in the Aloha Room at Oahu Mortuary, where the funeral services director regularly makes arrangements to send home the remains of visitors.