We have been to Xi a few times but only during the day.
The beach is pleasant enough and plenty of safe swimming. There is plenty to see around the area if you have a car and are prepared to drive west and north.
There is at least one cafe/bar close to the beach and the hotels in the area have restaurants. However looking at the website of one of the hotels, the pictures of the food seem more international than greek.
There will be more variety in Lixouri.
Others may well disagree however.
Bob's right, there is a place or two by the beach where you can have lunch and a beer but to my way of thinking, Xi is a place to visit rather than stay as it's rather out of the way from most of the island's main sights. If you're beach people, do drive over to the west coast of the Lixouri peninsula to Petani beach, it's a bit far off the beaten track to get that busy and the sunsets from there are spectacular as it faces due west
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