I'm going to Sardinia in April and plan on going to the Asinara National Park in northwest Sardinia to see the white donkeys. I can take the ferry from Porto Torres. I want to walk somewhat and not ride a little train or bus on the island but am skiddish to walk alone. I've done some research online but can't find a small tour or guide that would work for me. Has anyone been there and how did you get around? Thanks in advance.