No special access issues
To get from Alta City Center to Kvenvik, head south on E6, drive through Bossekop, and continue until you reach the exit for Fv883 (Kvenvikmoen). Follow Fv883 for about 3 km, and you'll have the exit to Kvenvik Motorpark to your left.
Parking at the south end of Langvannet close to the road (a little lake), at the entrance to Kvenvikmoen Motorpark. There are several hiking trails in the area, but there is a poorly visible trail from the parking spot.