The couple began dating after the Pushing Daisies star parted ways with David Thewlis last December (10) and Ifans recently took his girlfriend for a country break.
Friel worried she would forget to include a vital piece of equipment, so she packed as many possessions as she could.
She tells Britain's Radio Times, "Instead of a rucksack I bought a suitcase! I didn't know what we'd need. And I learned that being out there with nothing was the important thing. We had such a good time."
But Friel was clearly impressed by the Notting Hill star's campfire skills, declaring: "Rhys made heat!"