The Bravissima show is in Ocean World Casino. The show only is currently $35 US per person. Not sure if it is discounted for the kids.
The entire night is $69 US per person with a discount (I believe if there are 4) it includes prime rib and lobster dinner, drinks, dolphin and sea lion shows, and Bravissima show.
Sun Village is a 15 minute taxi ride to Puerto PLata. The taxi rate is posted. Go earlier in the day, not later at night. Walk along the malecon, see the Fort, dinner / drinks at Aguaceros or Jepols, ice cream at Mariposa (best in town) see Central Park and the church. Later on walk the Malecon again at night.
Carnival runs anywhere from mid February to early March. Almost every Sunday there will be festivities on the Malecon.
I hate to tell you but Sun Village has a serious lack of good evening entertainment....... Hmmmmmmmmm
I also suggest you go down to Teddy's Island BBQ Restaurant for some ribs and dump truck fries. THey are awesome.