Hola
I live in DR and i dive with Aligio everytime that i go to Las Terrenas , they are very experienced and they provide good personal service . I dive always with Paolo ( DM ) but last time was 1 year ago.
Las Ballenas is a very peculiar dive site with a lot of swim-trough small tunnels and caves , not a lot of corals but is a nice experience .
The best diving around is at the very tip of the peninsula of Samana . The place name is Cabo Cabron and it have several different dive sites ( Tibisi , La Catedral and Piedra Bonita - The Pinnacle ) . I don't know if they go in their boats because is more than 20 kms far but is bordering a really scenic coast , so if the weather is good it will be a great daytrip. Probably you will hear the humpback whales singing when you dive there.
Las Terrenas have some beautiful beach areas ( Punta Bonita is the best ) also some good small restaurants at Pueblo de los Pescadores and Hotel Atlantis.
If you like to experience something more exotic , try to arrange a daytrip to Las Galeras . Once there go to Playa Fronton by boat and you will be rewarded with a very spectacular sight .
Good luck
