Hi
Only just seen your post, hope you get this before you go, if not have a great time.
There are of course the 2 Aqua Parks, the old one in Sunny Beach and the new one in Nessebar (free bus service). 30 leva I think for an adult.
Nessebar is a lovely place, you can go by bus, or 30 mins by boat from Sunny Beach, 15 leva for an adult and 9 leva (I think) for a child, one way.
Day Trips - Bourgas (very cosmopolitan)
Kableshkovo - big market on Thursdays, nothing else much there.
Sozopol, Promorsko, Kiten - nice quieter beach resorts the other side of Burgas.
If you have not arranged airport transfers, can recommend
allysairporttransfers@hotmail.comHave a good time.
Regards