I never really understand why people would fly a long way just to stay in an all inclusive where they have no contact with the local culture. Anyway, if it's a beach and warm weather you want, I would think Spain and Greece would be the obvious choices. You can go to the Caribbean islands, but 1000 pounds isn't going to go very far at a 5 star resort. Try tripadvisor.com for recommendations.

Peruse the Thomson brochure. See link. I spent many years visiting different Greek Islands and was never dissapointed. Rhodes is mind blowing, especially the old town. Faliraki resort has a beach to die for and nightlife like no other.