Rangers at Wind Cave National Park will offer free tours of the Natural Entrance, Garden of Eden and Fairgrounds on Saturday and Sunday this week, and the weekends of July 18 and 19, and Aug. 15 and 16.

Normally priced at $7 to $9, the tours will be free as part of a national effort by Secretary of the Interior Ken Salazar to encourage Americans to visit their national parks.

"Entrance fees across the country are being waived these weekends in acknowledgement of the tough economic times the country is in," said park superintendent Vidal Davila.

Rangers will offer 30 cave tours a day this summer through the fourth-longest cave in the world beginning at 8:40 a.m. with the last tour leaving at 6 p.m. Visitors must have a light coat or sweater and sturdy shoes. All cave tours begin at the visitor center, open 8 a.m. to 7 p.m.

Surface activities this summer include a daily prairie hike at 9 a.m.,along with an evening campfire program given in the Elk Mountain Campground Amphitheater at 9 p.m.

For information, call the park at 605-745-4600 or go to www.nps.gov/wica.

Ladies tennis league begins in July: The Black Hills Tennis Association and the Rapid City Parks and Recreation Department are offering a ladies recreation tennis league on Wednesday mornings.

The league will start July 8 at Sioux Park and will run for five weeks. The cost is $24. For more information, call 605-343-6386.

Youth football, cheerleading signups soon: The Black Hills Youth Football League will host a festival from 10 a.m. to 2 p.m. at Founders Park on Omaha Street.

The event is a chance for boys and girls, ages 6 through 14, to sign up for youth tackle football or cheerleading. The festival will include inflatables, a dunk tank, music and food.

For more information, call 605-787-2563 or go to www.blackhillsyouthfootball.com.