If museums are on your list of things to see in Myrina, then you might want to head to Archaeological Museum of Lemnos. If you want to experience more of the culture Myrina has to offer, head to Myrina Port, Castle of Myrina, and Richá Nerá.
Agia Triada Cathedral is 5 mi (8 km) from central Myrina, why not stop by during your stay.