For expansions up to Seasons, Union Cove is a great option. There aren't very many empty lots, but there are plenty of empty houses if you need more room. Isla Paradiso is the only world that can have dive lots, even with cheats, so Isla Paradiso may be the best option if you are that keen on dive lots. I don't like the idea of Bridgeport skyscrapers anywhere else, so for premade bars and lounges, Bridgeport is the best. Riverview has countless empty lots for building on, placing lots, etc.
In short, there is no one world that can really house premade bars and lounges, dive lots and have plenty of space for lots from other expansions. Union Cove, Isla Paradiso or Sunset Valley 7.0 are probably your best bets.