In medium glass or plastic bowl, mix lime juice, honey and salt; toss with remaining salsa ingredients. Cover; refrigerate at least 1 hour. Meanwhile, soak cedar plank in water at least 1 hour.
Heat gas or charcoal grill. Place salmon, skin side down, on cedar plank. Make diagonal cuts in salmon every 2 inches, without cutting through the skin. Rub salmon with brown sugar.
Place cedar plank with salmon on grill over medium heat. When cedar plank begins to smoke, cover grill; cook 30 to 35 minutes or until salmon flakes easily with fork. Remove salmon from plank, using large spatula. Serve with salsa.