Not a great ep for the Captain, who seems to lack even a high schooler's understanding of the vagaries of the scientific progress. The sensible thing to do would be to stay in that Nicaraguan bay for some time, letting the crew socialize with the freed town, helping them build some houses, etc., and killing a s***-ton of monkeys in the name of Science!.
That said, it was a pretty compelling ep for a bottle show, even though I'm 95% sure that even if you're past your EAOS (end of active obligated service) date, you're not out until you're discharged, and even then you're usually in the inactive Reserves for a while anyway, so the Master Chief's comment that "technically, these guys aren't even in the Navy any more" was just plain wrong.
Not perfect, and the writing isn't HBO-level or anything, but the ship feels a heck of a lot more like a real ship with all sorts of people on it than Voyager did.
While mingling with the locals might be good for moral (at least for those who spoke Spanish), given an environment that comes with a global pandemic it is probably a bad idea. Now that you have killed off most of the personnel who guaranteed that infected locals didn't infiltrate the camp its probably only a matter of time before some desperate infected make it across the river, bypass the traps and reach the camp hoping for a way to survive. And who knows the incubation period for the people there. Someone could have been exposed to infected survivors, keep it a secret out of fear of being cast out and be a menace to anyone they come in contact to.
Are you going to put your shore leave party in suits? Are you going to test everyone who went ashore when they return to the ship? The doctor keeps saying that one infected crewmember could doom the entire crew. You might want to play it safe with interacting with the outside world until you have that vaccine in the interest of the greater good.
As for the episode, I was wondering if they used the oxygen tanks if they had a way of replenishing it. Also, since they have more crewmembers than suits . . . who were the unlucky (or lucky as it turns out) bastards who didn't have to suit up?