Uniquely Pittsburgh Duquesne Incline and Monongahela Incline Gateway Clipper Riverboat Tours Pittsburgh History and Landmark Foundation Walking Tours Pittsburgh Zoo and PPG Aquarium National Aviary Phipps Conservatory and Botanical Gardens Kennywood Park Just Ducky Tours (land and water tours) The Pittsburgh Tour Company (hop on hop off double-decker buses) Pittsburgh Steps; Southside Slopes StepTrek Pittsburgh’s Neighborhoods