Wouldn't it be more fun to chuck them on the L340 bus and ride across to the port?
Meanwhile, I've heard about some good trails on Ibiza, and seen the odd Strava line while walking up the GR221 but are there any good places to go around P/PP?? I might throw my old MTB on the plane next trip... (that'll be 4 bikes in P ... I should open a rental shop...)