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 there's a fresh water spa near the beach, 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