SAN FRANCISCO, May 6, 2015 /PRNewswire/ -- IfOnly, a marketplace for one-of-a-kind experiences that donates a portion of its proceeds to charities, is thrilled to announce the launch of a new initiative to benefit the 49ers Foundation. This new category offers fans a variety of one-of-a-kind experiences including a tailgate party with chef Michael Mina at Levi's® Stadium, a private-guided tour by a 49ers legend to see the 49ers Museum presented by Sony, as well as exclusive game tickets with on-field access. These unparalleled packages give Niners fans the rare chance to be amongst the stars of 49ers of yesteryear and today.