Visiting the green neighbouring island of Santo Antao is a lot of fun. Several ferries depart every day  from the port of Mindelo to Santao Antao. The sailing time is approximately 1 hour. You can buy tickets for the ferry at the counter in the harbour. Traveling independently to Santo Antao is perfectly doable. In the port of Santo Antao there are plenty of buses or taxis that can transport you further across the island.