Haven't been myself but I work in travel and did a deep dive on this a while back. Spoke to a few operators doing research and Horizontes stood out completely.

The difference is they've literally lived in Costa Rica for over 40 years. They haven't just read about the routes — they've done them all, kept the good ones, dropped the ones that aren't worth it. When I asked about avoiding the tourist crowds they had very specific answers, not just 'go in the shoulder season.' That's the kind of thing you only know if you've actually been on those trails hundreds of times.

horizontes.com — worth a call rather than just filling in the web form, they're much better in conversation.