Memorial Day weekend is the traditional start to summer tourism season.
This year New Hampshire officials expect 16.5 million summer travelers, an increase of 6 percent over last year.
They expect tourism spending to grow 4 percent to $2.16 billion.
Victoria Cimino directs the state Division of Travel and Tourism Development.
She says the state's promotional campaign promotes outdoor activities such as kayaking, whitewater rafting and mountain biking.
"Outdoor recreation is a major reason behind travel decisions to New Hampshire," Cimino says. "[At] state parks, 20 campgrounds are up 10 percent over last year."
June, July and August are the busiest travel months in New Hampshire, with most traffic coming from other New England states and the mid-Atlantic region.