Respawn within the ~5minutes, went off into the forest to lose the machine-gun-mounted-on-jeep-driven-by-baddies mobile, and when I went back to grab a car, they had respawned.
Not sure about the Malaria thing myself, either. Although I guess it adds a few missions, having to re-think your attack plan, because you suddenly need to pop a few pills means you need to have some variety.
And yes, did notice that the boats were much less prone to getting in trouble, especially at night.
Also, if you're getting bored of the same-same, try taking the missions on using pure stealth, next thing I'm going to do is do the 3rd (or 4th, can't remember) gun mission, which unlocks the silent MP5, and alongside my silent pistol, will be able to add a twist.
Also, later in the game when I have alot of spare diamonds, will get the camoflauge thing (45 diamonds
), and then start work on the assasination missions, with a trusty weapon of sniping ability