You should, of course, advise visiting friends to arrive on a daytime flight, window seat, the better to appreciate the sparkling azure waters as the plane swoops down toward MIA. Their appetites whetted, sign 'em up for Action Helicopter's 30-minute, 45-mile aerial tour. It lifts off from Watson Island and includes the port, the downtown skyline, Vizcaya, and Key Biscayne before heading up Miami Beach to Bal Harbour then looping around the west side of the bay for just $149 each (a quick, four-minute look will set you back only $35). If you're not feeling that munificent, you can always go asea on one of the Island Queen or Celebration bilingual boat tours ($15) that leave from Bayside Marketplace. Your guests will love ogling waterfront celeb homes (and you might just like it, too). Too touristy for you? Designate your driver and order a libation to ease the pain.