If it's Tarpon you're after you might want to take a look at the Caribbean side of the country at a place called Barra del Colorado. It is the home to some excellent areas for these very large silver fish. Costa Rica Tarpon fishing is second to nothing on the planet according to some sport fishing fans.
Are you looking for a Costa Rica Fishing package that is all inclusive, or just a one day trip?
How about 1/2 day trip for $200? Maybe you have something more in mind for the family and need a week on the water. Now we are talking a really good time. You are going to spend time deep sea fishing and inshore fishing. You will be able to run heavy equipment one day and a fly rod the next. There's a challenge for sure that awaits everyone on these types of trips.