I've walked some of the Wealdway in Sussex and a bit in Kent.
One of the highlights is the section over the high, rolling heathlands of Ashdown Forest. I hope the heather will still be in flower when you go!
In Buxted Park it's worth detouring from the route for a few minutes to see the beautiful lake.
Between Beachy Head and Eastbourne the route passes Cow Gap. A short detour leads down to steps giving access to the shore below the cliffs. A short walk westwards along the shore affords a spectacular view of the Beachy Head lighthouse. But one needs to be extremely careful of the tide times.
When I walked the stretch westwards from Tonbridge last year, the underpass under the A21 south of Lower Haysden was blocked and I did some roadwalking to get round it. I don't know if it's been reopened.
Where the route crosses the railway line near Hempstead Farm Stud, to the west of Uckfield, the crossing has been closed. From the East Sussex County Council map, it looks as if a diversion is now in place. I've always used Hempstead Lane to cross the line.
https://www.eastsussex.gov.uk/leisureandtourism/countryside/rightsofway/map/