Jack Black is entertaining guests at the swank Four Seasons in Kona — by sunbathing in a wetsuit. The actor has been vacationing with his family in Hawaii, and a witness says, “Jack was poolside in a surf suit down to his ankles, long-sleeved. Not surfing, just lounging with his wife and kids. He looked pretty funny. If that’s not a Christmas present, then I don’t know what is.” Black paid tribute to Led Zeppelin at the Kennedy Center Awards screened last night but recorded on Dec. 2.