The beach is what this place is about & it is good in as much as it shallow, clean & not very busy. However it's largely private, the water contains a fair amount of detritus & hawkers are numerous.
The secondary attraction is Venice; the launch point for the various boats is about a half hours drive away & once you're aboard the ride is about 30 minutes. However if you've come to the area with seeing Venice as the focus of your visit you're better off splashing out & getting a room in the city, Lido di Jesolo is the antithesis of this historic & beautiful destination.
The towns nightlife is busy but not raucous & the restaurants are fine middle of the road affairs though something of a qualitative glass ceiling exists.
LdJ doesn’t offer a first rate nightlight, a variety of activities nor is it an attractive or culture venue; if you have the kids in tow & need a week of cheap, untaxing beach time then it might be ideal but for adult traveller there is limited appeal.