Rental house landscaping

[Matthew King]

I saw no discussions specifically on this so I apologize if it's been discussed before.   On a rental I have very basic landscaping done and to be honest, it's kind of bland.  If a renter wants to make their dwelling look prettier is it feasible to just let them have at it assuming nothing is changed that isn't reversible?   Obviously if they don't care then I don't see the point of me spending money or anything while they are there for cosmetics.  

What about fixing/updating the walkway leading up to the front door?   It's not in disrepair by any means but the bricks are starting to sag, is that an area of concern?