Here's the info for each area from the City of Charleston Department of Recreation:

City Gym
65 Hagood St.
Free; Participant agreement required Mon-Fri 3-4:30pm
724-7338

Deming Park
5th Ave. Maryville
$25/school year
Mon-Fri 3:30-6pm
769-8280

Forest Park
780 W. Oak Forest
$50/school year Mon-Fri 3:30-6:30pm
769-8259

Lenevar Playground
1305 Lenevar Dr.
$25/school year
Mon- Fri 3:30-6:30pm
556-7393

Martin Park
155 Jackson St.
$25/school year
Mon-Fri 2:30-6:30pm
973-7222

St. Julian Devine Community Center
1 Cooper St.
$25/school year
Mon-Fri 2:30-5:30pm
724-7350

Westchester Playground
Secssionville Rd.
$25/school year
Mon-Fri 3:30-6pm
762-2499