I'm not too familiar with the roads up that end of the country but if you are venturing a little south then take the A487 to Aberystwyth. From Aberystwyth take the A4120 to Devil's Bridge (some spectacular waterfalls here). There is a cafe in Devils Bridge and as you go past it there is a turning right into a country lane. Take this turning right and the road will take you over the Elan Valley to Rhayader. When you get to Rhayader turn right and take the A470 to Builth Wells and then the A483 to Llandovery. There is a biker cafe in Llandovery (West End Cafe). From Llandovery take the A40 for a short way towards Carmarthen and then turn right onto the A482towards Lampeter. Following the A482 will eventually bring you to Aberaeron and just down the coast road from Aberystwyth where you started. These are just some of the most amazing roads and that ride alone should take you all day.