Bird-watchers come to Ouray to spot rare birds. The Box Canyon Falls have the USA’s most accessible colony of protected black swifts. There are surprising numbers of unusual birds in town, including warblers, sparrows and grosbeaks. The visitor center has resources for bird-watchers, and the excellent Buckskin Booksellers has books and guides.
There are stacks of things to do in and around Ouray. Remember that Ouray falls within the purview of tour and activities providers in nearby Ridgway, Montrose and Silverton, and even Durango and Gunnison – so check what's on offer in those towns as well.
The other top activity is hot springing. Ouray Hot Springs is wonderful for families, while just a bit down canyon, Orvis Hot Springs has a more natural garden area and is a nude-only option best, erm, suited for adults.