I've been to Poseidon a handful of times now and always have an okay time! The food is pretty good, the service is okay, but the view is beautiful! Definitely sit outside on the patio - where you get a front row view of the waves. <br />
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Poseidon seems to be a staple for the North County / Del Mar folk, but I'm not quite sure it lives up to all the hype. Still recommend you to try it, if for the sunset alone!