One can put together a very nice run combining the riverside Greenway Park and Springbank Park. The route combines sections of the Thames Valley Parkway path with additional park paths. There are sections along the river and also some trails slightly inland through fields and woods on undulating terrain. The London Pacers Running Club has mapped a 10k course and a 5k course. There is an exact 5K route in the park as measured by AIMS measurer Bernie Conway. See here for specific directions.
Longer Run: Many more km heading east and north on the Thames Valley Parkway. See our route there.