En route to Risa just prior to being abducted by the Romulans, Geordi asks the shuttle computer what the weather is like down on the planet. The computer responds by telling him that Risa is climate-controlled for optimum tourist comfort.
Which tourists are in view? Humans only? Any humanoids? I find it hard to believe that all humanoids would be optimally comfortable in the same climate. Ferengis, Klingons, Bajorans, Andorians, Vorgons, and many others surely don't all agree precisely on what climate is best, comfort-wise, for "vacation" or rest.
Perhaps there are different areas on Risa, each with a different climate. Or maybe individuals can choose their own climate, as like in a holodeck.