Jenna Bush said her “boyfriend” – she doesn’t like the word “fiance” – proposed after rousting her at 4 a.m. to go hiking on Cadillac Mountain in Acadia National Park in Maine.

“It’s supposedly where the sun first hits the United States,” President Bush’s daughter said in a television interview about her recent engagement to her longtime boyfriend, Henry Hager.

“I did not want to go hiking at 4 in the morning,” she said. “It was freezing. But we got up, and we hiked in the dark for an hour and a half, and then when we got towards the top, with the sunrise, he asked me.”

In an interview that will be broadcast Friday on ABC News’ “20/20,” Jenna Bush, a 25-year-old elementary school teacher, described Hager as “smart,” a “hard worker,” “open-minded,” “fun” and “very supportive.”