We visited Kourion with our three children (6, 4, 1) in early April. Our kids loved it. Spent a couple of hours here. Cost E4.50 for adults and the kids were free. First thing to note is that the location is absolutely stunning overlooking the sea. It was a hot day and there was a lovely breeze blowing over the whole site. Took us about 2 hrs for a bit of a whirlwind walk between the different sites. The best bits for us were the mosaics. The gladiators house being particularly amazing. This really must be a definite stop for anyone visiting this part of the island.