Guys, we want to make a one day trek starting from Landmannalaugar and return back on the same day. However we will only have a basic car which is not allowed on rural road such as the one which goes there. What is the best place to leave the car and take the bus from to Landmannalaugar, any advice?
Go to the BSI Coach Terminal. You can get a bus there to Landmannalaugar. You'll arrive right around noon, so you won't have a lot of hiking time, I'd bet, before the last bus leaves. I'd recommend you reserve a spot at the Hrafntinnusker Hut, sleep there and then return to the trailhead in the morning. Here's a little bit more about that hike.
Mentioned in this answer: