I like when there's little things in game that give you options for story telling.
If I were you, I'd take them to Sulani to live there for some time, maybe the guy could catch a tan and learn some of the culture of his love interest. If snowy escape brings rental lots in the patch, you could move them back to settle in Willow Creek after some time abroad and vacation in Sulani regularly to keep both happy :)
Whatever you choose I think it would be nice if their home has a little reminder of both the worlds via clutter/decor