Most temple complexes open about 6 AM and don't close until 6 or 8 PM, although the hours can be irregular and the doors may be locked for no reason. If that's the case, approach any monk and explain you'd like to visit. He'll normally open up the temple. There's no admission charge, but leave some change in one of the collection boxes. (By making a donation you're also "making merit" and easing your journey to the hereafter.) In some temples, caged birds are for sale—you're expected to set them free, another means of making merit.