The Norwich Society - the city's heritage watchdog - has looked in detail at every park in Norwich and identified the issues that need to be addressed.
It is hoped the survey will encourage council parks officers to address any concerns raised.
As well as general under-use of parks, the report also noted that maintenance at nearly all the parks was excellent.
However it singled out Castle Gardens being particularly neglected and found Mile Cross Gardens also fell below standard.
Norwich Society chairman Alec Hartley said:
"We have probably got one of the best collections of public parks in the country, but they do seem to be under-used. We would like everybody to think of ways that the parks can be better used."
Other problems included vandalism, and in some cases a lack of signage made some parks difficult to find.
Toilets at the parks were deemed to be just about adequate, but those at Mousehold were in a poor state, and Waterloo Park's restored pavilion was shuttered.
Friends of Mile Cross Gardens secretary Gail Caldwell said: "We have been doing a lot of tree planting with the local schools, Mile Cross and Catton Grove Primary, to try and encourage them to get involved in wildlife.
"We had new play equipment about 18 months ago, but we are now desperately trying to get someone to donate £750,000 to us to do up the two pavilions in the park."
For more information go to http://www.thenorwichsociety.co.uk.