The Fjallsárlón is the small sister to the Jökulsárlón. For this lagoon was even more stunning as there been nearly no other people the first time we visited it. It is a nice place to do a picnic there or cook a tea/coffee and enjoy the amazing view.
Where to park: Fjallsárlón can be reached over a dirt road, at the end of it is a parking spot. The road can be driven with a none 4×4 wheel drive but it is not really pleasant and it will take up to 30 minutes or longer.
What to do: hike down to the lagoon and enjoy the view.
Tips: In order to get to the smaller more hidden jams of Iceland you need to rent a 4×4 wheel drive.
Personal opinion: Smaller and quieter lagoon that is worth to drive there.