Since acquiring Lanai from his fellow mogul David Murdock in 2012, Larry Ellison has tinkered constantly with the Hawaiian island’s only beach resort. He redesigned its lobby three times in three years, opened a Nobu restaurant on the property—only to renovate and reopen it a few months later—and shut down an entire wing of the resort to re-create it to his contemporary-Hawaiian tastes. Eventually, last June, Ellison shuttered the Four Seasons Resort Lanai to finalize its multimillion-dollar transformation, ov…