We had a rented City Mini... I pinned (homemade) patches to the top of the hood. We also hung our diaper bag on the back which made it easier to tell it was ours.
I saw some cool bike lights at out Dollar store recently that I have thought about for night time.
I made some name tags on bright 4x6 cardstock and laminated them. I will zip tie them to the rented (from apple- not wdw) stroller. I also have some neon tulle that is cut in strips that I will tie to the handle. Should make it pretty easy to identify.