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The Castle is the home of the Oklahoma Renaissance Festival, The Halloween Festival, The Castle Christmas, The Boare's Heade Feaste, and one of the largest selection of fireworks in the state of Oklahoma.
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One of Muskogee's premier parks with a botanical garden, butterfly pavilion ($3 admission), ponds, and, in December, the highly attended Garden of Lights show.
This reflects on the history, art, and culture of the Five Civilized Tribes (i.e. the Cherokee, Chickasaw, Choctaw, Muscogee, and Seminole) whose center of government was located at The Indian Agency here on Agency Hill, even before white settlers had arrived.
Kind of small, but gives some background on Oklahoma's past and present music scene, as in Merle Haggard and Carrie Underwood, the latter of which hails from Muskogee, for instance.
A regional history museum, covering railroads, old schoolhouse days, Native American affairs, Muskogee citizens' contribution to the US military, etc.
Muskogee War Memorial Park
This salvaged US submarine serves as a military museum. Oddly enough, it nearly came untethered in a flood in 2019, so it was almost like there was a submersible floating around in the Arkansas for a while.