preposition for the seas and oceans
Go on a cruise (by, along ,on ) the Caribbean sea

Please , tell me which are the prepositions to be used inthis type of sentences.

Thankyou ever so much

Question

preposition for the seas and oceans
Go on a cruise  (by, along ,on )   the Caribbean sea

Please , tell me which are the prepositions to be used inthis type of sentences.

Thankyou ever so much

Answer

You can use either "along" or "on."

Answer

We say:
Go on a cruise IN the Caribbean.

"Seas" is redundant here!

Answer

Not By or Along, but either:
"Go on a cruise on the Caribbean sea" or "Go on a cruise in the Caribbean sea". 
One sails, paddles, boats, or takes trips along rivers, though.