Plenty of flat roads near the coast. Lots of tunnels and ferries to avoid the mountains. And it has other pluses like considerate drivers, not much traffic, wild camping allowed anywhere, everyone speaks English, huge investment in cycle paths, helpful people, low crime, lots of good campsites. Such a low stress society it's almost like one of those sci-fi films where the perfect life has been achieved at a terrible cost, e.g. everyone over 30 being made into Soylent Green.