From towering alpine peaks and ancient cliff dwellings to massive sand dunes and dramatic canyon walls, Colorado's four national parks showcase just how wildly diverse the state can be. This guide covers Rocky Mountain National Park, Mesa Verde National Park, Great Sand Dunes National Park, and Black Canyon of the Gunnison National Park, with a mix of must-see sights, scenic drives, memorable hikes, and roadside stops to help you make the most of each adventure.

Visiting Great Sand Dunes National Park in May offers a unique chance to explore one of Colorado’s most striking natural wonders without the summer crowds. The towering dunes, the refreshing Medano Creek, and the surrounding landscapes create an unforgettable day trip. I recently spent a day there in May, and I want to share everything you need to know to make the most of your visit.