There's not much info here. Here's a few thoughts:
Is it possible they were meeting someone for a horse-related purpose at Mohawk park? It has six miles of equestrian trails. Horseback riding and camping at , which is located near Tulsa, Oklahoma
"Mohawk Park, containing 3,300 acres, is the largest park in Tulsa and one of the largest city parks in the country." Mohawk Park | TravelOK.com - Oklahoma's Official Travel & Tourism Site
Driving a Taurus suggests they were probably going to the Ft. Worth horse show as spectators unless someone else was transporting horses for them with a truck and trailer.
Also, the POI was identified but not named. However, LE hasn't said he's no longer a POI.