This is a better place to ask or look for the answer as far more contributions - It is easy to find recommendations of local tour operators, - go to a browser and enter 'message grenada cruise' and the first link returned should give you all the info you need. Repeat as necessary for each island you are interested in.
Me and my husband would like to go to the caribbean on the ocean village, as we are both 72 is it suitable for our age group, do they do trips to suit older people, we have been on thomsons cruises but not to the caribbean Ihave read that ocean village was for the younger people.
We have been on ocean village twice age range vast
cruise is suitable for you I would say avarage age 60.
In Barbados for the first time you can walk into Bridgetown which has shops and a beach (cross the river by the bridge)
St Lucias favourite trip is to see the Pitons-can be done via ship or private excursion
Mayreau is a tiny island with no real scope for trips-it is wonderful though-nice beach warm sea etc
Been to most of the places you quote-you will enjoy them.
Had an amazing time last Xmas with OV2, try river tubing in Dominica it's great fun. The Grenada spice tour is really interesting as is the Pitons and drive in volcano tour in St Lucia.St Vincent has some great beaches also.
Don't miss the catmaran to Soufriere in St Lucia. There's non-stop rum punch, reggae music, a hot lunch and opportunities for sight seeing and swimming, apart from the "drive through volcano" (it stinks of sulphur!) and a beautiful forest walk for a half hour. The catamaran holds about 100 people. Standing at the front with the sun beating down, wind in your face and spray flying was simply fantastic!
The rum runner trip in Grenada is one not to be missed. You board a small ship and straight away the rum is flowing....you are whisked off to a beautiful beach where you have the option of water skiiing, bannana boat etc... On the way back the alcohol is still flowing and the friendly staff on board begin a limbo, everyone is a little tipsy by now and ready for a giggle. (watch out for the staff, very talented. Can limbo with a tray of 12 fill glasses resting on their belly!)
Also on Ocean Village 2. Look out for Libby on the events team. I met her there last year and we are still in touch. She is hilarious and brilliant at what she does - Love ya Libs! Also, swam with turtles in Barbados - amazing experience. Definately reccomend! Hope you enjoy your holiday!