Neighborhood parks should be attractive destinations for urban children and thus help provide a protective shield against sedentary lifestyles. This research study explores the relationship between neighborhood socio-ecological environments (influences on getting to the park) and associations between park physical environments and levels of physical activity in different age groups (attractions in the park). The impact of ‘walkable’ neighborhood environmental characteristics upon physical activity has not been well-explored in children and youth, and results to date have been inconclusive. Park characteristics such as trails, bike paths, athletic facilities and playgrounds could provide attractive destinations. Twenty parks were randomly selected from a pool of 45 in central Durham, North Carolina, a moderately-sized (pop. 205,000), socioeconomically diverse city in the Piedmont region of North Carolina. In-park activity was measured using SOPARC (System for Observing Play and Recreation in Communities) for children categorized as young, middle, or older. Observations were collected over a period of 8 contiguous weeks during the mid-summer months of 2007. Environmental audits were performed to define park environments. Park Entrance Service Areas (PESA) were created using park entrances defined during environmental assessments and a ¼ mile network-distance buffer with parcel-line boundaries in ArcView GIS (ESRI, Redlands, CA) and used to analyze network connectivity, land use characteristics, sociodemographic characteristics, and crime data. Detailed case studies were conducted in the three most heavily used parks using behavior-mapping methods. Results include: 1. Analysis of park-level characteristics, aggregate physical activity measures, and neighborhood characteristics. 2. Correlational analysis of behavior setting characteristics and levels of physical activity by age group. 3. Multi-level analysis of behavior setting, park, and neighborhood characteristics, and their respective associations with physical activity by age of children.