I'd go with Bus to DHS and walk or Boat to the Boardwalk but maybe take a taxi back to AKL so you don't have to worry about getting to DHS before it closes to get a bus back.
Defintely quicker to take a cab but for an evening ADR or just visiting the Boardwalk - Bus -> Boat is the way I'd go.
They stop the buses whenever the last guest leaves the park.
But I don't think a bus driver will take you to a closed park or that there will even be a bus to take. Now AK may be different since I'm not sure when Rainforest Cafe outside the park closes.
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