The Delfines is unusual for Varadero in that it's a cheap all-inclusive that inhabits the town itself rather than the spread-out hotel zone to the east. If you're used to Meliá-style luxury, then this 103-room resort probably isn't your bag, but if you don't mind sharing a cozier more modest hotel with mainly Cuban guests, it could cut ice.
The hotel abuts a lovely scoop of wide protected beach and there are plenty of shops and restaurants around should you tire of the all-inclusive package (and you will).