Near to Le Bombarde you can find Lazzaretto beach. It's a shorter beach than Le Bombarde but much wider so you'll probably find a place for your umbrella. Sea water here is the coldest of the whole gulf, as the currents carry it from the deeper sea, but it's always crystal clean. This beach is famous in Italy because of a TV commercial by Barilla pasta maker that was shot here with the old tower in the background and with a famous song by Vangelis as soundtrack.
You can reach it by bicycle in about 35 minutes, almost all in protected bicycle lane, or by Beach-Bus service managed by company Cattogno