Darren Wood, 42, from Carshalton, south London, has taken part in 913 parkruns at 96 different locations and has also volunteered 410 times.
LFB Commissioner Andy Roe said the bereaved, survivors, community and staff are owed a commitment from the service to keep learning.
The group helped clear and replant a bank of wildflowers, repainted a mud kitchen, redesigned a water play wall and spruced up the lawn.