We just got back from 4 nights/5 days at TDP national park. We booked our trip through Cascada travel, staying at their EcoCamp and one of the Park's Refugios. Primary reason for booking through this outfit was to not have to deal with logistics of transportation and we had heard that the hosterias and refugios were often booked up in high-season (though in one of our stops at the hosteria, we asked and there were rooms available). Transportation and itinerary was seamless through Cascada and I'm really glad we didn't have to deal with trying to get around the park. There didn't seem to be a lot of (if any) public transportation options and the Park is vast and very spread out.
EcoCamp was a bit more rustic than we expected but it grows on you. I was surprised by how nice the Refugios and Hosterias were - modern, clean and very much catering to the non-hard core hiking tourist (in the case of the Hosterias). It would've been nice to have some of their amenities (one of them had a spa) but it also would've taken away from our experience. In the end, very glad we stayed at EcoCamp.
The scenery at TDP is breaktaking, beautiful and one of kind. The terrain is really amazing, and the variety in the mountains is so unique. The weather can be unpredictable, but we were very lucky, only light drizzles off and on, and one spectacular sunny day. I also liked that there are varied sights in the park, from lakes, to grand mountains, to glaciers, to wildlife. It really adds to the experience.
The hiking is very good - the trails were pretty well-marked, for the most part - we had a guide on all our hikes but I think it could be done individually without too much trouble. The "W" circuit is sort of what everyone does, or at least some portion of it. There were always people on the trails, which is good or bad depending on your preference (but keep in mind we were there in peak season), but never overwhelming amounts of people (i.e. tourbus crowds). I think this is owing to the fact that some of the hikes, if you do them all the way in, are rather challenging and lengthy. The more casual hiker may only do a portion of the hikes in, but their views are more limited. Our first hike was 18 miles into and out of French Valley, and to be honest, we had not trained enough for it. It was really tough (though the views gorgeous).
I would love to go back but it is a long ways away. I'm curious as to how Chilean govt will handle growth in the Park. While this is an experience everyone should have, hopefully the growth to accommodate visitors is done in a controlled manner. It truly is a special place.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.