Hi.... well I didn't visit Dominica with Princess... but Seabourn... and their excursions offerings were POOR.
So, I negotiated my own island tour with a taxi driver and picked out what I wanted to see.
I will tell you that this is a very POOR island, so don't be alarmed at what you see.
If you head for the rainforests.... bring or pre-apply bug spray. My ankles got chewed up.