The death of 17-year-old Keahihoku Lum, who was struck by a boat on Maunalua Bay last month, is a tragic reminder that traffic on the ocean can be as dangerous as that on land.

It's especially true at Maunalua Bay, which on any given week is buzzing with activity: personal watercraft, boats, swimmers, parasailers, fishermen, divers, snorkelers, paddleboarders, kayakers, surfers, canoe paddlers and kite surfers.

While the cause of the accident remains under investigation, one thing is clear: In an ocean environment as busy as Maunalua Bay, it's critical that both government and individuals improve efforts to be vigilant and proactive about safety on the nearshore seas.

Some positive steps are being taken. The state Department of Land and Natural Resources will be phasing in a requirement that boaters complete an online safety course, according to DLNR director Laura Thielen.

DLNR will also re-evaluate the zones that separate and regulate activities in the bay — displayed on colorful maps posted onshore — to determine how they can be clearer, more useful and possibly more strict.

Public input is essential in this area to ensure DLNR makes changes that better reflect the myriad needs of the bay users.

But it's not enough to tweak the rules. They must also be understood, followed and enforced.

Boaters must respect no-wake zones. Divers must use flags to warn of their presence. Personal watercraft users must stay in their designated areas. And when rules are violated, enforcement must occur.

But with only about 100 enforcement officers statewide, the Division of Conservation and Resources Enforcement can't manage this alone. The public must do its part.

Reporting violations to the DOCARE is one way. Another is participating in Malama Mauna-lua's Makai Watch program. Like Neighborhood Watch, a reliable presence of observers can discourage would-be violators.

But ultimately, a safer Maunalua Bay will depend on the willingness of those who enjoy it to exercise proper caution and respect for each other.

At a public meeting Tuesday night, one participant noted that in the wake of Lum's death, commercial boats have noticeably slowed down.

It's an encouraging example of greater awareness and the kind of vigilance that must continue to prevent another tragedy from occurring there ever again.