Useful tourist apps?

Hi -
Can anyone recommend any apps that are good for visits and tours round cities and towns (by foot)? I am looking for something that offers the functionality of Google maps, but also lets you plan and store trips and routes point by point, and ideally has sites and points of interest marked, recommended routes and even information about sites available.
Thanks in advance,

I use Maps.me (MapswithMe). You can make point and path on Google Maps and export to kml or kmz. Maps.me undestend those formats.