After pickup from your centrally located hotel by coach, depart Reykjavik in the morning for Vestmannaeyjar, aka the Westman Islands. You'll drive a scenic route along Iceland's south coast, then take a ferry boat from the terminal at Landeyjahöfn. Upon reaching Heimaey, you're met by a local guide for a bus tour of the archipelago's main island and eponymous town.
Listen to onboard narration about the devastating volcanic eruption of Mt. Eldfell in 1973, which spewed lava and ash over the island. Learn about the town's moniker, 'Pompei of the North,' and efforts to excavate some of the nearly 400 homes and other structures that were covered in ash. Along the way, admire the Herjólfsdalur valley, stop at a nesting area for puffins, and soak up the fresh sea air in one of the windiest places in the world.
After a break for lunch (own expense), join a guided boat tour around Heimaey island. Keep your camera ready to snap photos of sea caves, lava fields, and nesting seabirds on the cliffs. Following the boat tour, spend your free time exploring the town. You can visit the volcanic cone of Eldfell or go to Eldheimar, a museum with interactive exhibits about the volcano (admission fee included).
In the evening, the ferry takes you back to the mainland, where a coach will be waiting to take you back to your hotel in Reykjavik.