4 of the 5 onsite resorts (Portofino Bay, Hard Rock, Royal Pacific, and Saphire Falles) have water taxi service. Each hotel's boats simply run from the resort to the dock at City Walk. Back and forth, all day (I think service stops at 1 or 2 am). So, if you want to go from the resort to the parks or City Walk, just hop on the hotel's boat and you'll be there in a few minutes. If you want to go from the parks or City Walk to your hotel, go to the dock at City Walk and get in the line for your hotel. Finally, if you want to go from your hotel to another hotel, just take the boat to City Walk and then get in the line for the destination hotel's boat.