Some of the key walking areas include the Wye Valley AONB, Cannop Ponds and Mallards Pike. There are many other routes through the woods and Ordinance Survey is a great place to start to plan a route.
Some of the Forest of Dean and Wye valley walking guides and journals by @aboutglos.
This is a long extended all day Wye Valley walking route starting at Staunton in the Forest of Dean and heading downhill through some very wild woods. Eventually, the walk reaches the river at Biblins footbridge. The route then heads upstream on the Doward side to the hand ferry at Symonds Yat. This is a great place for a rest and refreshments, the Saracens Head pub is very accomodating.
The walk then proceeds downstream passing the rapids and follows the river past the Seven Sisters then open farmland to Monmouth.
From Coleford to Monmouth
A long day hike starting in Coleford and heading through the hills towards the quaint village of Newland. From there you pass through woodland and head downhill in the valley towards Redbook. Redbrook is an ideal refreshment stop with 2 pubs joined by a viaduct that crosses the River Wye and England/Wales border. From there the route takes you alongside the riverbanks through pretty meadows to the small city of Monmouth.
Ruardean To Lydbrook
A downhill walk starting at the top of Ruardean Hill and descending through woods to the pluds. The route then proceeds via country lanes to the River Wye at Lydbrook.
Joys Green to Symonds Yat
The walk from Joys green to Symonds Yat was chosen as it is the closest stop I could find to the River Wye in Lydbrook that was a direct service. The Bus is the number 23 from Gloucester.
Having reached the River Wye in Lydbrook the next part of the walk is easy navigation, downstream all the way, following the river until reaching the Saracens Head. This gives you the chance to explore and freestyle walk.
Exploring the woods at The Stenders, the hill above the village of Drybrook. This is a nice walk along narrow trails and ideal for freestyle or sort walks. There is evidence of wild boar activity in the woods and a great place to see the fauna of the area. This area is not far from the Bailey Level mentioned in my Gold Mining page.
Plump Hill to Drybrook
A walk from the fishing pond near to Plump Hill above Mitcheldean. This walk takes you through some great woodland and has great views over the village and local quarry.