The island is called Ormsö in Swedish.
Historically Vormsi was inhabited by coastal Swedes and before World War II more than 2500 people lived on the island. During the Soviet occupation Vormsi was a closed border-zone, where guests could arrive only with government permission. There are approximately 240 inhabitants.
The nature on the island is very diverse. Vormsi Nature Reserve has been brought to life to protect the numerous plant and bird species supported by coastal grasslands, reed beds, alvars, forests, bays and lagoons.
If you're going by car, make sure you refuel, because there aren't any petrol stations on Vormsi.
Vormsi is best toured by bicycle or on foot. Both bikes and boats can be rented on the island.
The island has several dedicated places for tenting - either for free or for a fee. There are also several guest houses.
The official Estonian tourism website provides an extensive list of options for accommodation in Vormsi.