With Shuttle Parking, you have to take a free shuttle bus to and from the airport. The buses run on a frequent basis, so no need to worry about lengthy waiting times.
With Valet Parking, you hand over your car to a chauffeur at the airport terminal. They then drive your car to a secure parking facility. A chauffeur will also bring back your car once you have returned from your trip.
Park & Walk involves parking your car nearby the airport and taking a few minutes' walk straight to the terminal. Once you have returned, simply walk back to your parking spot.
Spend the night at a nearby hotel and hop on a shuttle bus the next day, which will take you straight to the airport. The hotel staff will also pick you up upon your return.