Käringsund Game Safari is a small wildlife park rather than a wilderness experience, but it is a pleasant family stop close to the ferry harbour. Tours pass through enclosures with deer, wild boar, ostriches, llamas, and other animals.
It works best as part of a relaxed Käringsund afternoon with the harbour and museum, not as a reason to cross Åland by itself. Check the current schedule in summer, as visits are normally organised as short guided drives.