The first holes of the back nine run to the west, away from the glare. Also, consider playing The Dog or any tropical course in the afternoon. While the sun can be strong in the afternoon, it almost always seems hotter and stickier in the morning because the breeze has not yet risen and overnight irrigation has evaporated. If he's good, then by all means keep him at your side. You might also ask him if he can get you good cigars at a discount in the city of La Romana.
Some caddies make the offer without asking.
The Links course at Casa de Campo plays entirely inland and doesn't look a bit like a Scottish links. Still, it's a charming 6,461-yard track that starts out fairly easy and gets tougher on the back nine, where a good deal of water comes into play. If your game is rusty after its winter hibernation, consider playing The Links, with its course rating of 70 and slope rating of 124, before doing battle with The Dog. You might also have a word with Gilles Gagnon about playing La Romana Country Club. Generally one or two tee times a day are open to guests of the resort.