Peter,
Ek'Tun, owned by Phyllis Dart, originally from Colorado, is maybe 12 miles up the Macal River from San Ignacio. Going toward Benque, you turn left on the Chial Road like you're going to duPlooy's or Chaa Creek but then bear right toward Black Rock Lodge. It's maybe 3/4 of a mile before you get to Black Rock. But it's on the other side of the Macal, so you have to wait until they send a boat over for you. Great place -- just two cabanas.
--Lan Sluder