There are a number of nice walks from the Chellington Centre:
Walk 1: Carlton Village & The Pipers - Directions (pdf)
Walk 2: Harrold-Odell Country Park - Directions (pdf)
Walk 3: Harrold-Odell Country Park & Odell - Directions (pdf)
Walk 4: Country Park & Odell (wet weather route) - Directions (pdf)
These walks are free and self-led.