We went to the Titanic last year 12th May for 1 week and this year at the Larespark next door, 29th April for 2 weeks. Both times during the day, the temps regularly hit 30+. Lovely sunny days - daylight from 6am til around 7pm (if I remember correctly). The nights were a little cooler though, especially this year, with us going end of April.
You def needed a cardi or light jacket, especially if you were sat still watching the entertainment. Of course if you were dancing, you were plenty warm enough. The kids and hubby just wore t-shirts. There are plenty of bars indoor though and the bowling,cinema etc are all indoors.
I thought the pools were very chilly, except the kiddies pool, with being so shallow, warmed up quickly. Plenty of people were in the pools so I guess they weren't that bad... The sea however was much warmer.
Regards your choice of hotel, although I have never stayed at the Lara Beach, the Titanic gets much better reviews and is newer and def has the wow factor. It is one of the best 5* on Lara beach. - beaten only by the Delphin Palace and Barut Lara. (only my opinion of course). Anything else you want to know, just ask away.
Denny