We stayed at Lido di Jesolo last year for a few days (me, DH and DD7)as part of a longer holiday and despite reading beforehand that it wasn't everybody's cup of tea, we really enjoyed it.
What we liked was that it was lively but in a very family friendly way. Evenings in particular were perfect - loads of restaurants and shops and neon etc but absolutely no drunk people, no brits abroad types.
What other places might we enjoy along similar lines? Doesn't have to be Italy although we did love it. Decent beach/sea essential, location with scope for day trips preferable.