Calleva at National Harbor organizes adventures that traverse land, water, and air, each designed to inspire the intrepid with the bounties of nature. A terra-based encounter, the guided bike ride over the Woodrow Wilson Bridge and Mount Vernon Trail combines the thrill of physical activity with the wonder of american bald eagle and bald presidential monument sightings. From 10 a.m. to 12 p.m. on weekends, pedal pumpers are treated to panoramic views of the Potomac River. If the allure of the deep overcomes grounded wanderings, embark on a watery outing in a solo kayak, canoe, or tandem kayak, from 1 p.m. to 3 p.m. on weekends. After a mind-stretching lesson on paddling and water safety, boat brethren can drift through the National Harbor in their floating vessels and explore the shores of the District and Alexandria, stopping occasionally to feed breadcrumbs to migrating politicians.