There are no buses that go from resort to resort. You would have to either take a cab or take a bus from CSR to Hollywood Studio then get on a bus to POR from there.
Another option would be to take a bus to DTD and then get on a boat that takes you to POR. It would take a little while, but the boatride would be relaxing before dinner.
Garden Grove is at the Swan. Take the bus to DHS and you can either take the Friendship boat to the Swan/Dolphin. It will be the first stop. Or you can walk the path adjacent to the canal to the Swan.
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