When are you heading up?
We have weekly night rides on tues/weds/thurs (whichever day works out most suitable on any given week). Monthly Epics (We're off to Doethie valley on Sunday).
If you prefer to ride alone, then Nant-yr-Arian has plenty to offer from remote XC to swoopy singletrack descents.
ClimachX is only 25 mins away to the North and offers one of the best descents around (heading off there on the night ride tomorrow). There's also all the descents from the Dyfi Enduro in the same forest and these can be linked in.
To the south and east is the Doethie Valley (see this/last months MBR), Elan Valley (MBR Route), Builth Wells (Merida).
So nah, there's no real riding to be had around here ;)