Hi Pam, You can get more ideas for each port by going to the Destinations section and reading there.
GC-if you have never done the stingray thing, you have to do it!! We booked privately in advance through Captain Marvins website.
Belize-we will prebook something with a reputable company or use Carnival's excursion next time. We waited until we tendered into Belize and then it was a hassle(long story), but we ended up being very happy with the Goff's Caye excursion that we got from a company within the cruisers 'compound'.
Roatan-we did snorkeling (after dropping stuff off at an orphanage).
Have fun researching all your ports! The Valor is really nice!!
Brenda