Burgas in May

Bulgarian here, not much experience with our sea side cuz' I consider it grossly overpriced and tourist-ridden. This is how I'd put things.
>Partying and beaches at: Burgas, Slanchev Bryag (Sunny Beach) and Pomorie.
These are meme party locations though, shit music (chalga), easy girls and what have you. You can clearly bonk off to the city to find a club with alternative music, but the beachfront is shit.
>Laid back at Sveti Vlas
>Sight-seeing in Nesebar and Sozopol
Good news is that you can day trips to each and any of these and still sleep in Burgas if you want. July and August are optimal as far as weather goes. Go as late as possible in May.