Playa del Carmen bonefishing
You're right about the $100 for round-trip transportation. That's for the ride only. A day's guided fishing goes for about $350. I fished with Pesa Maya (pescamaya.com) in March. They did a good job in lousy condsitions--high winds and overcast.
The ride is in a beat-up van and takes nearly three hours each way. A better alternative might be to rent a car for a day and drive down and back. It's faster and would be more comfortable. THe outfitter can give you driving directions.
Take Crazy charlies and pink and white and Merkin crabs in tan.