During our stay in Ubud, we were told that Lovina is the perfect place to relax and to get away from the crowds (i.e. Kuta).
Unfortunately, the beach of Lovina is full of rubbish, plastic bags etc. When we were there (Jul 12), only 2-3 people were sunbathing or swimming. The only thing really to do is dolphin watching (mixed feelings however; 30 boats chasing 6 dolphins). They do have a few shops and restaurants but you can' t really call it a promenade. Maybe it is different another time of the year.
They city itself is pretty much the same, we decided to leave after 1 day. Don't fall for the jungle treks they offer, it was about $45 for a 2hour trip and not worth the money.
There are much nice spots on Bali.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.