We would like to go to someplace where it is warm in February and has great beaches but also some cultural/historical or other things to do. We would do Florida or any of Caribbean even islands off of South America.we are a retired couple

Just about every Caribbean island has what you are seeking. We need more info to help guide you.

What type of budget do you have for airfare, accommodations, food and activities.

How long a trip are you planning?

Where will you be flying from?

How long are you willing to travel to reach your final destination?

Are you willing to take one or more connecting flights and/or ferry rides, perhaps even having an overnight stopover on route, to reach your destination.

What type of accommodations do you require - simple hotel room, large suite, multi-room condo or private villa?

What type of activities interest you?

How warm is “warm”? Florida and the Bahamas can have temps in the 60’s and 70’s F. in February. The further south you go the warmer it will be.

Do you want to visit a large island or do you prefer a smaller island?

How about topography- do you want a flat coral/limestone based island with little vegetation and white sand beaches or are you looking for a volcanic based mountainous island with lush rain forests and darker sand beaches?

Do you need shopping or casinos?

Are you into eco-tourism?

As a side note, February is completely the busiest time of year--many islands are sold out already! (or at the best places to stay at reasonable prices)

<even islands off of South America>

Did you have specific islands in mind?

I've seen temps in the 50s in Florida in February. I swore I'd never chance it again that early.
If you want to be warm in Feb, you need to be further south than Florida to (guarantee) warm weather.