At the tip of the Seltjarnes Peninsula you will find black sand and an impressive coast around Grótta Lighthouse. It´s a nature reserve with lots of birds and wildlife. There has been a lighthouse here since 1897. This one was built in 1956. It´s a lovely place to admire the Atlantic. When it´s clear you can see accross the water to Reykjanes and the Snæfellsnes Peninsulas.
From May 1st to July 30th Grótta Island is closed to protect birds so you MUST stick to walking paths and cannot visit the Island. If you are disrespectful and do happen to get too close to a nesting terns eggs they may dive bomb at your head and you may also get a fine.
Many species of birds nest in the area. Seabirds, such as Arctic Terns, form a colony on the rocks, and freshwater species, such as tufted ducks, can be found in the beautiful adjacent pond, Bakkatjörn. You may also see the occasional seal.
The water here is exceptionally clean so if you are partial to a bit of cold water swimming then this is a great spot!
In winter it´s a great spot to see the Northern lights. If you want to venture across the rocks to the lighthouse make sure you check the tides otherwise you risk getting stranded there! You can see the tide chart here.
Also, make sure you don´t miss Kvika geothermal footspa. It´s nestled away just before you get to the lighthouse.