My kids rent my home & it's bathroom remodel time-cheap or $$$?

[Gail W.]

My adult daughters rent our home...the one they grew up in. We moved to a tiny house on a farm, but they wanted to stay, so we've allowed them and their college pals to rent it for years. They are now all successful adults and 1 is married. They both state they want to stay in the house forever...(BOTH want to own it one day-we'll let them fight that one out!)

The master bath is in the master bedroom that the eldest daughter rents (she pays double what the married daughter upstairs pays w/ a shared bath).  There was water damage from the bathroom up above and now there is a big hole in the ceiling above the shower, the pan is disgusting, the tiles are broken, the flooring is warped... it aint pretty! The shower will be converted to a bathtub as all of us girls LOVE baths. (As I MAY have to live in the house someday and that would be MY room again, I too desire a tub...but I do NOT want to live there any time soon...it would be an option only if a life altering event took place...my fall back). 

Right now, it is 60's white subway til in a size no longer made. The shower pan is an old worn out fiberglass job.  After ripping all of that out, we will need to decide if we go easy with an acrylic/fiberglass 3 pc tub surround OR the more difficult job of tiling the whole thing above the tub.

FACTS:  We have never tiled before. We can not afford a pro. We do have family that can give pointers, however, they are not pros, just DIY'ers.  We have no plans on SELLING this home any time soon. We have no plans of renting it out to "strangers".  We just remolded the kitchen (via an insurance covered slab leak incident) and I'm not thrilled with the way the kids are keeping it up...it's very high end; like a fool, I asked for the best of everything. My girls don't seem to be the best at housekeeping chores. It's all concrete slab. We will have to bust up the slab to install the new tub drain and fixtures. WE have a life; we run a small farm and travel.

I'm torn; do we just do a quick/easy surround that the eldest will be happy with and be able to maintain? And if we ever move in, redo it?  Or do we take the time and effort to do tile and hope she keeps it nice?