. >> my name is mark heasman. i run a children's charity in london. it's a delightful country. far we've been in reykjavik. but we're now just about to go out on a three-week expedition around the interior, so we can't wait to get away from the people. >> reporter: we met heasman in the thingvillur national park, another destination on the golden circle route. it's a world heritage site and place of great national importance to icelanders as a legendary meeting pointet throughout the centuries. >> this particular point seems really crowded actually for somewhere that's so special andc so unique. it's actually a bit disappointing to see it full ofl tourists. but then people need to see it, i guess. >> reporter: fishing used to be iceland's most important industry. but it's now been overtaken byn tourism, which accounts for a third of the country's foreign currency earnings. since 2010, there's been between a 25% to 30% increase in the number of visitors each year. and so this year, 2016, looks like being a record season with government agencies predicting 1.8 million arrivals. >