Reykjavik, Iceland

Wake up in the darkness and grab a quick bite at The Laundromat
Simple food but does the trick when you need a full day's fuel inside you for glacial adventures
Head out on the Golden Circle Tour (use Mountaineers of Iceland) and check out the Gulfoss, Geysirs and Langjokull Glacier
The glaciers in Iceland are some of the most incredible landscapes I have ever seen
Head back from the Golden Circle Tour via The Blue Lagoon. Eat lunch in the Lava Restaurant and then take a dip in the Lagoon. Be sure to book a water massage a couple of weeks in advance.
There is no place like the Blue Lagoon on earth - just spectacular.
Head back into Reykjavik and have a drink at Kex Hostel
A hidden gem. It's a basic hostel but the bar and restaurant feel like a New York Lower East Side / London Shoreditch style hangout. They also host great intimate gigs.
Eat dinner at The Grill Market. Make a reservation or get just as nice an experience ordering appetizers in the lounge with cocktails
Great atmosphere and perfect basement bar for those cold nights.
If you have the energy, head out on a midnight Northern Lights tour to chase down the Aurora Borealis
If you're lucky enough to see the Northern Lights you will just be blown away by their magnificence.
I would stay at: If you're on a budget, stay at Kex Hostel - no question. If you want the best Reykjavik has to offer, stay at Hotel 101.
Great boutique hotel and definitely the best place to stay in Reykjavik. In need of a refresh in the next couple of years but still great.