My wife and I stayed at the Hacienda Baru for four nights over New Year's (2012) in a 'Superior Room' near the pool and took advantage during our three full days there of walking most of the trails available to all who stay there. We also took a birding walk, from about 5:30am until early afternoon, with one of the excellent guides, Juan, who took us up into the hills on rainforest trails that are available only with a guide.
We absolutely loved this place and look forward to going again some day. The trails are varied and informative, with well-written panels in English, Spanish and French, to explain various features of the forest, its plants, animals and other fauna; beautiful birds and monkeys are plentiful out in the forest and at times around the grounds near the rooms, too; the extra, guided outings are very reasonably priced and expertly led; the ambience is very friendly and relaxed both in the restaurant (which serves good food) and the pool, which is lovely; and our room was both huge and comfortable in every way. It seems to me to have something for everyone, really. A youngish mother whom we got to know with her daughter had a great time there, as did other families with kids. Couples would find it cosy and romantic. Groups with varied interests could probably find plenty to do, with individuals going their separate ways. And so on.
Shops and restaurants in (much over-rated) Dominical are very nearby, if you want to eat elsewhere, as we did one evening.
As the website for the place will explain in detail, the Hacienda Baru was once partly a farm and ranch, though it comprised a very large tract of untouched rainforest as well. The principal owner, Jack Ewing, became more interested in the natural world than in being a farmer and cattleman (since at least the mid-1970's, I believe) and over the years has very actively participated in the regeneration of that part of the property which was formerly farmland, and has made the pristine wilderness more accessible. There are beach walks, swamp walks, walks through former cocoa and teak plantations, and of course many forest walks. This is a delightful place to be, but also a great, thoroughly successful experiment. We were delighted to witness and in some small way support it.