The grave marker/site of Geronimo is located in the Apache Indian Cemetery at Fort Sill.
Whether his remains are truly in this grave remains disputed. Here’s an article I found on the subject:Times Record News (2/20/09): Comanche descendant: Geronimo not buried at Fort Sill
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Best directions I have found are:
“Old Fort Sill, North of Lawton, Oklahoma: From I-44 in Lawton, Take Exit 41 on to Sheridan Road, Turn Right on Randolph Road (Follow signs) to Quinette Road right turn pass the Patriot Club and the Golf Course pass under I-44 and follow signs to the Apache Cemetery. Cemetery is on right side of Road.”
Fort Sill Military Reservation, Fort Sill, OK”(from: BlogOklahoma.us – Geronimo Grave Marker)