Btw there's only one u in Edinburgh.
Portobello beach has quite a few places to eat and drink along the prom, also along the High Street theres a nice Greek pastry shop, a fantastic bagel shop and various pubs.
West Edinburgh also has a beach, Silverknowes. Theres great wee cafe at Silveknowes end, at Cramond nd theres a few cafes, walk up the river Almond or even out the causeway to Cramond Island ( keep an eye on tide times)
The Museum in Chambers Street is free, as are the Modern Art galleries at Belford Road.
Get day tickets for the Lothian buses then you can go on and off all day
If he Fringe is still on just wander around the city centre, there will be buskers, acrobats... you name it.
Last Saturday in August sees Porobello Prom taken over by buskers of all sorts, in the totally unofficial Big Beach Busk.