From the desert gardens to the red rocks of Sedona, the northern mountains to the depths of the Grand Canyon, this 6-day spring adventure offers outdoor enthusiasts an itinerary filled with education and scenic beauty led by geologist and study tour leader Wayne Ranney.

Washington, D.C.'s Southwest Waterfront is a study in contrasts: The neighborhood retains some of the most historic architecture in the federal capital and boasts one of the largest private development projects in the city, the District Wharf. Laid out by the Carroll family in the 1770s, the neighborhood teemed with commercial activity by the 1830s. In the mid-20th century, huge swaths of the area were demolished in the name of urban renewal. Carolyn Muraskin, founder of DC Design Tours, leads a tour of the historic neighborhood.

Washington, D.C.'s Southwest Waterfront is a study in contrasts: The neighborhood retains some of the most historic architecture in the federal capital and boasts one of the largest private development projects in the city, the District Wharf. Laid out by the Carroll family in the 1770s, the neighborhood teemed with commercial activity by the 1830s. In the mid-20th century, huge swaths of the area were demolished in the name of urban renewal. Carolyn Muraskin, founder of DC Design Tours, leads a tour of the historic neighborhood.

Washington, D.C.'s Southwest Waterfront is a study in contrasts: The neighborhood retains some of the most historic architecture in the federal capital and boasts one of the largest private development projects in the city, the District Wharf. Laid out by the Carroll family in the 1770s, the neighborhood teemed with commercial activity by the 1830s. In the mid-20th century, huge swaths of the area were demolished in the name of urban renewal. Carolyn Muraskin, founder of DC Design Tours, leads a tour of the historic neighborhood.

Naturalist Matt Felperin leads a two-day adventure for nature lovers that explores the Delaware Bay and its environs, where the diverse life of a tidal marsh and the expanse of the bay come together. From observing horseshoe crabs breeding by moonlight to visits to the Bombay Hook National Wildlife Refuge, the Dupont Nature Center, and local beaches, the tour offers insights into a habitat in which a wide range of migratory shorebirds play a key role.