"I am trying to decide which month will have the best hot weather between May and July"
Probably May. Rainy season and hurricane season starts in early June and continues all of July.
"I would love something along 7mile beach."
Most of the adult only all inclusive resorts in Negril are located on 7 Mile Beach.
"My budget is $1500 a person"
For $US3000 for a couple for four nights in almost all of the rooms at all of the adults only resorts is within your budget.
"I would like a resort with good food and drinks. We would like good watersports, activities and entertainment"
These are available at virtually all of the large all inclusive resorts. The differences between most of the resorts is the group you are thinking of staying at are often a matter of individual taste and/or very specific to ones desire. For example, if sport facilities are the most import of all to you then pick Couples Sweptaway while Hedonism II may be the best choice if an active (very active) nightlife is the single most important factor to you, and Sandals Negril would be the choice if a long beach plus a swimup pool to the room is your thing.
See the following to specify more factors that are important to you in picking a resort.
Edited: 9:28 am, August 22, 2013