This is a good place to relax and make bus tours to different places. Good for a nice short holiday of a few days.
For example: The blue Lagoon (hot nature bath in luxury suroundings. For the night an excursion for hunting the Northern Lights (you could be lucky) Excursions at sea looking for whales... Excursion to GEISER, Waterfalls, Pingvellir National Parc etc.. there is so much to see in a short distance of the city. Renting a car and doing everything on your own... Good restaurants/coffee lunch places are found in the city centre.