An estimated 1,500 visitors a day hike across the lava flow fields to view the ocean entry and search for active lava breakouts. Round-trip walking distance is far; a one-way trip to the ocean entry from Kalapana is around 4 miles. Add the chase for active lava, milling about, and your hike will quickly add up to more than 10 miles when you return.
Modern science could not exist without exchange of data and ideas. The exchange can be informal — at meetings and in casual conversations — or formal — in papers or books that can be studied and debated for years to come. The old axiom, publish or perish, is as true for science as it is for scientists.