Pack a few snacks and enjoy a relaxing family day out at Sognefjellvegen. There's loads of space for the kids to run about and get some exercise.
You're spoiled for sightseeing choice when visiting Lom. Sognefjellvegen is a great place to kick off here, but there are lots of other fine sights to appreciate. Galdhopiggen, and Jotunheimem National Park are not far from the outdoor recreational space and will round out your day nicely.