One km from Jinotepe. It cost 90 cords (near U$5) per person (childrem over 3) to enter. No food or drinks allowed past gate (water OK). The lunch we purchased inside was poor (chicken dry, meat tough), extra for rice and very pricey (even before the 25% 'tax'). But the pool and waterslide (only one worked) were clean and lots of FUN.
The story of Sandinista Herty Lewites is one of Nicaragua's most interesting. Ask any Nica.