I visited this site as part of a 4-day trekking trip in April 2013, but it can be a day trip either with any of the numerous tour agencies in town or independently via combi/local bus. The surrounding scenery and the walk to get to the sarcophagi and back is beautiful. As others have mentioned, the path down to the site (and up on the return) can be a bit tricky in the rainy season. It's basically a sloping dirt road pitted with holes and trenches, which easily becomes a muddy mess during rainy season. When I was there (tail end of rainy season), I was able to navigate without rubber boots. If it were any wetter, though, you should expect to get muddy even with wellies; quagmire would be an understatement. The locals do rent horses, but some people in the group who weren't familiar with riding found it hard to sit comfortably because of the slope and unevenness of the path.
The sarcophagi themselves seemed a bit underwhelming. There are 6 that are nicely preserved and nestled into the hillside, but you can only see them from a distance, so any observation of details would require either a zoom camera lens or binoculars.
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