A high-protein diet can help build muscle, which comes in handy for fighting off a shark that is also on a high-protein diet. Take a bite out of the circle of life with today's Groupon: for $15, you get $30 worth of grilled fare and drinks at Castle Ranch Steakhouse, in the lobby of the Boise Hotel & Conference Center.

Castle Ranch's menu features beef from the local Double R Ranch, locally sourced Idaho ingredients, and a respectable wine list to complement any entree. Meat lovers can sink a fork in the 8-ounce filet mignon ($28.95), while pescatarians can savor true Western flavor with a boneless, pan-seared rainbow trout, tossed with capers, lemon, and brown butter ($16.95), each served with seasonal vegetables and a choice of cheddar hash, hand-cut fries, or a baked or mashed russet potato. For lighter eating, venture into the sandwiches and salads selection and try the open-faced steak sandwich, Double R sirloin with crispy buttermilk-battered onion rings on sourdough, served with fries ($15.95), or a classic caesar salad with romaine, parmesan, ciabatta croutons, and caesar vinaigrette ($5.95).

Castle Ranch's upscale ambience and casual-dining atmosphere caters to all customers, from formally attired paupers to sneaker-sporting kings in hiding. Unwind with friends over a glass of Steak House cabernet sauvignon or Sockeye chardonnay ($7 each).