For $30, today's Groupon gets you a revitalizing facial or deluxe mani-pedi at the new Spa de Mar (a $100 value), located at 50 Ferncroft Rd. in Danvers. Though Spa de Mar's in a perfect location for northern sububanites, city dwellers will need to take a calming drive through the pastoral Massachusetts countryside (well worth it for this deal). If you've got friends in the area, alert them via skywriting, air horn, or carrier pigeon that today's deal gets them a whopping 70% off a relaxing spa treatment. After all, a mani-pedi is even better when you make a girls' outing of it.