When booking a trip in Mexico, you rent the entire boat so if there is just one person, it is the same price as for four. We booked a trip through the resort who found two others willing to share with us.
Even people who are not die-hard fishermen should try this. I had never ocean fished before but had a great trip. Six dorado, a marlin, and a sailfish. What a great day. The ocean was very smooth although I have heard it can get rough.
The views from the boat on the Pacific side are magnificent, although you can book a sightseeing boat tour and see the same but why not try to catch some fish at the same time.