A quick look at Phoenix City Maps shows that the following parks are
fairly centrally located:

(note they are also fairly common for corporate picnics)

Squaw Peak Recreation Area (Phoenix Mountains Preserve) 
2700 E. Squaw Peak Lane 
(602) 262-7901 
Hiking/Riding Trails, Ramada/Picnic Area, Ranger Station, Restrooms,
Trailhead parking lot 

Papago Park 
625 N. Galvin Parkway 
(602) 256-3449 
(602) 256-3220 (Reservations) 
Archery; Baseball Stadium; Botanical Gardens; Fishing; Golf Course;
Hiking/Riding Trails; Horseshoes; Orienteering Course; Ramada and Picnic
Area; Restrooms; Softball Complex, lit; Volleyball; Zoo 

Encanto Park 
2605 N. 15th Ave. 
(602) 261-8993 
(602) 262-6412 (Central Distict) 
Boating Concession (602) 254-1520 
Enchanted Island Concession (602) 254-2020 
Basketball, lit; Boating; Children's Amusement Park; Exercise Course; Golf
Course; Handball/Racquetball, lit; Picnic Area; Playground; Pool; Softball 

South Mountain Park (Phoenix Mountains Preserve) 
10919 S. Central Ave. 
(602) 495-0222 
Activity Complex, Hiking/Riding Trails, Interpretive Center, Lookouts,
Museum, Natural Features, Ramada/Picnic Areas, Ranger Station, Restrooms 

The Railroad Park (McCormick) (A Little East But Nice Park)
7301 E. Indian Bend Road 
Scottsdale, Arizona 85250
(480) 312-2312


Derek