At that time of the year there should be plenty to see at Bryn Bach Park in Tredegar (5 minutes from Rhymney) - Great Crested Grebes with young, a good mixture of ducks plus small flocks of warblers & finches.
Trefil Quarry is ideal for Raven, Wheatear, Peregrine, Kestrel, Merlin, Little Owl & Pipits plus a remote chance of Ring Ouzel (may be a little late).
I will review my old birding logs & give some more suggestions in a couple of days.