Eagles Park & Campground
Primitive camping is available at Eagles Park, located nine miles north of Pioneer Park on Highway 1804, just south of Double Ditch Indian Village State Historic Site.
https://www.bisparks.org/facilities/eagles-park-campground/

This cache isn't part of the passport program, it's an extra.
Bismarck Parks and Recreation District (BPRD) has partnered with the North Dakota Geocaching Association (NDGCA) and Bismarck-Mandan Area Geocachers to establish geocaching sites within BPRD’s system of parks and trails.
To participate in the BPRD Geocache Challenge, take a passport from the container or get one in advance by printing it or picking it up from the park office during normal business hours. Match the hole punch to the coordinating number on the passport. Once you have found all 12 of the park caches, return to BPRD office at 400 E. Front Ave., Bismarck, to claim your prize!
Remember to place the container back exactly where you found it for the next visitor to enjoy!