At a micro level, if those jet fittings in the tub are white plastic that has turned yellow, you can make them look at lot better by removing them and spraying them with white spray paint that is intended to adhere to plastic.At a macro level, if you want to modernize the bathroom with a lot of work, move the toilet to the shower area and enclose it in a separate room.

@Mark Fries thanks for the brutal summary.

In today's economy there's just too many other fish to fry.

I was doing some plumbing this past weekend connecting CPVC to cast iron and the 3/4" CPVC compression fittings will fit around the 1/2" iron pipe.I don't think the sharkbites or the white plastic compression fittings will work though just the CPVC compression fittings.Here's a picture of it:They are $3.92

Assuming it's not an A+ luxury unit in the most desirable part of town, then I'd usually recommend a plastic shower curtain instead of a glass door, because it costs much less and can be changed easily between tenants (whereas a glass door often accumulates water spots that can be difficult to fully clean after a few tenants...and, as you mentioned, if a tenant breaks a glass door, that could be a costly headache).Also, assuming it's not an A+ luxury unit, I'd usually recommend going with a fiberglass unit (either tub or shower) instead of tile, because tile is usually more expensive, and it can be more likely to begin leaking, and it requires more upkeep.

They set up tenting of a sort, with plastic, and they had heat within that area for just a few feet of space from the side of the house.

PS: every unit you own should have a good quality fire extinquisher mounted in the kitchen where it is easy to access.A real one, not the $6 plastic 8 ounce special.

Then we would lay plastic down ( usually just a plastic garbage bag torn open) and then we would put down the woodchips/ rocks / whatever substrate you choose.

The one piece units and plastic surrounds look and feel cheap.  

All the electrical outlet covers need to be changed, white plastic is ugly and cheap and has no place in a $500K home.