PURPOSE & CORE VALUES. . Mammoth Lakes Tourism (MLT) is the official destination marketing organization for Mammoth Lakes, California. Mammoth Lakes Tourism invites visitors to align with our community’s values. —. through the responsible promotion and stewardship of our mountain destination. —. to bring economic vitality to Mammoth Lakes. Commitment. Our passion for Mammoth Lakes drives everything we do. Stewardship. We proactively care for our ...