Sue,
when you get to Arillas just pop into Arillas travel as they do trips cheaper than the tour companies,some boat trips do go from arillas but not sure which.The transfer time is NORMALLY about 1 to 1 1/2 hours by coach,transfer by taxi takes about 35 minutes depending on the taxi driver.we were in the same position as you last May thats why we got a taxi from the airport.The flights this year from Exeter are later than the one last year,we took off last year at 0920 should have been 0930.