1st post thanks for the help everyone

We are going to be going on a cruise for our honeymoon the 2nd weekend in June 06.

Leaving from Detroit which is Northwest Hub, but there are a lot of others also.

Would we be able to book our cruise using a new CC ($3,000) then right away turn around and use those points for our flight to the cruise location? We will most likely be leaving from Florida.

What CC would be the best option for this, and can it be done, as the turnaround time is so quick. Is there a time limit on when you can cash in your points? Is it even worth it?

TIA