The 16 - mile bike course will take most riders 45 to 65 minutes to complete .
The 16 - mile bike course follows the highway just outside of the park for 8 miles east and then returns along the same route .
The 16 - mile bike course , which follows the highway just outside of the park for 8 miles east and then returns along the same route , will take most riders 45 to 65 minutes to complete .