My son and his bride to be will be going to Mackinac Island for their honeymoon. The details aren't planned yet, but they will probably stay for a week. I've never been there, but I'm helping with making the arrangements. Do you recommend that they rent a car for the week and park it at the ferry parking lot on the Mackinaw Ciy side in case they want to come across to Mackinaw City and want to do other things during the week? Or won't they need a car?