Finnish road network is in very good condition and traffic is moderate. Renting a car would be a great choice to get here. More than 100 kilometers of the highway from Helsinki-Vantaa airport has 120km per hour speed limit during summer season. Most of the rest is 100 km per hour speed limit. In winter time the speed limits vary between 80 and 100 km per hour. You won't be wasting your holiday time being stuck in traffic jam.