The Cuyahoga Valley National Park is offering a summer challenge to hikers.

Hikers are asked to complete 10 of 13 designated trails in the 33,000-acre federal park between Akron and Cleveland between June 1 and Sept. 30.

Participants who complete the 2008 Cuyahoga Challenge will earn a commemorative patch designed by Akron artist Chuck Ayers.

The trails range from 1.5 miles to 12.4 miles and from easy to difficult.

The free program is being staged by the park, the Cuyahoga Valley National Park Association, a friends-of-the-park group, and North Akron Savings Bank.

Last year, 330 participants successfully completed the hiking program, said Joanna Caley of the friends' group.

The trails are:

• Tree Farm Trail, from Horseshoe Pond Trailhead off Major Road, Peninsula, 2.75 miles, easy.

• Hale Farm Trail, from Indigo Lake off Riverview Road, Cuyahoga Falls, 2 miles, easy.

• Oak Hill Trail, from Oak Hill Trailhead off Oak Hill Road, Boston Township, 1.5 miles, easy.

• Lake and Salt Run trails, from Kendall Lake Shelter off Truxell Road, Boston Township, 4 miles, moderate.

• Ledges Trail, from Ledges Shelter off Truxell Road, Boston Township, 2.2 miles, moderate.

• Cross Country Trail, from Kendall Lake Shelter off Truxell Road, Boston Township, 2.5 miles, moderate.

• Ohio & Erie Canal Towpath Trail, from Frazee House in Valley View to Station Road Bridge in Brecksville, 5 miles, moderate.

• Boston Run Trail, from Happy Days Lodge north parking lot off state Route 303 in Boston Heights, 3.1 miles, moderate.