No, there is no ice vending on Rock Island. You will have to take the Karfi ferry back to Washington Island to get ice at one of the commercial outlets like the Mann Store. No, you don't need a sticker like at other parks. You cannot buy a park sticker on Washington Island. No, there are no conveyances available for camping gear.
Rock Island is a backpacking park only.
A. No, bicycle riding is prohibited at the park. You can lock your bike up at the parking lot on Washington Island while you visit Rock Island State Park. Yes, there is one pay phone at the park's contact station. Yes, so you can bring your own phone with you. There is no electricity with which to charge your battery, however.