Iceland Vow Renewal - Private Land Owners?

Does anyone know how I can get in contact with some local land owners in Iceland that have waterfalls on their properties? I have been in the wedding industry for a long time, and my husband and I are planning something simple for our vow renewal, but I know a lot of ceremony sites are privately owned and you need to arrange an agreement with them. We don’t feel like hiring a planner all over again as we have spent so much time in Iceland but want a more private spot during our actual vows.