The answer to this question depends upon what specific activities you are interested in doing. The scenic drives at Arches and Canyonlands National Parks (Island in the Sky District) can be driven in a few hours each. Therefore, if you have a limited amount of time to stay in the area, you can get a good sample of both parks in one day. However, it is advisable to spend at least a full day at each park so you can enjoy a few hikes to better experience the parks. Several days can be spent at each park if you enjoy hiking many of the longer trails, and Canyonlands National Park contains enough backcountry to keep dedicated hikers and backpackers busy for years!