We took a private taxi for 4 people, but only to English Harbor & Shirley Heights.
The Taxi tour was $20 per person + tip (Plus $5 admission (each) to the park)
We really enjoyed Nelson's Dockyard, but then again we are both history buffs.
We also enjoyed the view from Shirley Heights where you can see Eric Clapton's Antigua home and studio.
As you can see, with Devil's Bridge thrown in, Lawrence's tour sounds like a good deal compared to what we did. Plus he is experienced enough to know when to get you back to the ship.
While you are there, try and watch some Cricket!
April 1, 2006 - Serenade of the Seas - 7 days to the Southern Caribbean
October 8, 1984 - NCL Sunward II - 3 day cruise to the Bahamas