Come sweat away frustrations at the Chinquapin Park Recreation Center at 3210 King St., Alexandria. The center houses a 25-meter swimming pool, four racquetball courts, a sauna, a fitness room with free weights and machines and a snack bar called "The Greenery," which serves a varied menu. A sun deck adjacent to the pool has chair and chaise lounge seating.

Organized programs for all ages are available in aquatics, exercise, tennis and racquetball classes, as well as camps.

A daily admission is charged ($2.50 for adults who are Alexandria residents, $3 for nonresidents, $2 for Alexandria resident children, $2.50 for nonresident children, $1.50 for all senior citizens) or patrons may purchase discount passes. The discount pass includes use of the pool, locker room, sauna and fitness room for 25 visits for a $45 fee. If another pass is purchased when the 25 visits have been used, one complimentary visit will be awarded.

Private swimming, tennis and racquetball lessons can be arranged by calling 931-1127. For general information on all the center's activities, call Janet Barnett at 931-1127.

Gunston Hall will stage a production of "George Mason of Gunston Hall" in celebration of the bicentennial of the U.S. Constitution. This is an original play written and directed by Fletcher and Margaret Collins of the Theatre Wagon of Staunton and will be performed on the Gunston Hall porch.

Two performances will be given -- one at 7 p.m. Saturday, Aug. 22, and the other at 7 p.m., Sunday, Aug. 23. The play lasts 30 minutes and, afterward, a question-and-answer period on Mason's role in producing the Constitution and the Bill of Rights will be held.

A candlelight tour of the mansion and a dessert reception with artists in the Ann Mason Meeting Room also will be offered after each performance.

Visitors may bring blankets, folding chairs and picnic food. The gates to Gunston Hall will open at 6 p.m. Admission is $10 per adult, $5 per child.

The performances are partially funded by the Virginia Foundation for the Humanities.

The Fairfax County Public Schools Head Start program is now accepting applications for eligible 3- and 4-year-old children for the 1987-1988 school year.

Head Start, which operates in more than 40 classrooms throughout the county, is a free preschool program for low-income families to help prepare children for school. It also offers support assistance such as health and social services, as well as screening, therapy and referrals for handicapped children. Parents are encouraged to participate in all aspects of the program.

For additional information on the program and registration locations, call 698-7500, ext. 8824.