Yes, I think the park is worth the visit. It is a fun and safe day out and away from the resort. You can make it a day or half day excursion. The park offers free transportation to and from your resort. You can check the bus schedule with the Allegro. The price is around US $ 25.
The excursion offers the shows: the dolphins, sea lions, dancing horses, parrots, taino indians, and other entertainment. The grounds have walking paths and you can observe tropical birds, iguanas, caymens, and others. You will also enjoy the flowers and tropical growth along the footpaths. There are restaurants and of course the mandatory gift shop.
Also, if you want something different to do nearby the Allegro there is a "Gokart" track, "Tropical Racing". It is usually open from 5 pm to 10 pm and they offer free transportation. In addition there is the Marinarium closeby. It is a marine park where you can snorkel and sightsee and they offer free transportation.
www.manatipark.com
www.marinarium.com
Regards, PJT
Note: To swim with the dolphins is an additional charge.