What should I write in my description?
Describe the actual day — where you go, what you target, what is on board, and who the trip suits. Specifics convert; adjectives do not.
The guest is trying to answer one question: is this the right day for my group? Tell them where you fish, what is realistic in each season, how long the run is, what is included, and who the trip suits — families, serious anglers, first-timers.
Naming the water you actually fish — the Marietas, El Morro, Corbeteña, El Banco — does more for you than any amount of 'unforgettable experience'. It is also what people search for.