- Come explore the amazing trail system at Martin's Access County Park, located in Cherokee County Iowa! The park trails offer gorgeous views with rolling terrain along the Little Sioux river. The trails provide an exceptional experience for everyone, no matter your skill level. The Run will include a 10k run, a 5k run/walk and also a kid's run. Come explore the amazing trail system at Martin's Access County Park, located in Cherokee County Iowa! The park trails offer gorgeous views with rolling terrain along the Little Sioux river. The trails provide an exceptional experience for everyone, no matter your skill level. The Run will include a 10k run, a 5k run/walk and also a kid's run.