See portlands best sights and the spectacular natural beauty of the nearby columbia river gorge with this combo tour use your 2 day hop on hop off sightseeing trolley pass to explore top portland attractions such as the international rose test garden powells city of books and the oregon zoo at your leisure on your tour of oregons picturesque columbia river gorge visit towering multnomah falls and bonneville dam and travel back to portland in the footsteps of famed explorers lewis and clar