Dill is the Michelin-starred restaurant. It's quite good and relatively reasonable given the quality. It may seem odd to have Mexican food in Reykjavik, and yet Burro, a relatively new restaurant, is quite good. Good cocktail bar - Pablo Diskotek? - above. Reykjavik has a strong indie music and craft beer culture. There's some good food at places that combine those. Mikkeller, of course, has a great assortment of beer and in Reykjavik they have pizza crafted by the Dill folks. Many places have happy hours. There is an app for that you can get. Getting outside Reykjavik, choices become more limited so it can be good to have snacks or sandwich items. Nóatún is the grocery I preferred as they have a lot of specialty items, decent produce and bakery. They also have freshly prepared food at lunch for reasonable prices. Other grocery stores are less expensive, but lesser offerings.