I booked 10 cabins with Carnival, I received a credit for 1 person free less all the taxes etc. also a $75.00 per cabin onboard credit. Are there any other perks I should ask for?

Fruit basket, chocolate covered strawberries,a bottle of sparkling beverage in each cabin.Bon Voyage!!

And a new Mercedes for everybody. You sure can ask but the perks are pre-set for groups and you are already getting good ones. Unless your travel agent is real nice and would add something out of his/her pocket, probably this is it. And if you booked it with Carnival directly, most likely there will not be anything else. Good luck!

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Group amenities are negotiated at the time the group is formed.