Beach in Ibiza for adults

My husband and I would like to find a beach for our port day in Ibiza. We don’t want a “party beach”. Something beautiful, relaxing, good food and drink, and preferably somewhere where we can reserve loungers and umbrellas for the day. I know this is a lot to ask. Any ideas? I did post this on the Spain board but I thought somebody who is not looking at that board might have an idea.

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http://www.cntraveller.com/gallery/best-beaches-in-ibiza-spain

Booking sun loungers in advance might be an issue - never knew that was a thing. Every beach rental outfit i've seen in Europe (apart from private beaches in Italy and South of France), which admittedly isn't exhaustive by any means, always seems a cash in hand affair