I was there 2 weeks ago. The park was not upto standard especially for foreigners as they are charged Taka 150 for entry! The main building was under renovation and most of the area looked deserted. A lot of local just walking around the lake. I felt it was a waste of time and energy.
5 minutes drive will take you to a small/old neighbourhood called Panam city. Beautiful architecture and very friendly local. I walked around the neighbourhood for more than an hour. A small lane with pretty little houses and the photos came out amazing. Definitly worth a visit.