For humans...
Could you all tell me how to get custom scenery, car textures, logos, walkways, buildings and rides in No Limits (by rides I mean thrill rides not roller coasters) please?
For custom scenery you need to do that yourself, using 3d programs such as Object Creator found here: http://gravimetricstudios.com/software/objectcreator/index.cfm or Anim8or found here: http://www.anim8or.com/main/index.html
With car textures, you can add a .png or .tga file in X:>Program Files>NoLimits>cartextures and add them to your coaster.
With logos honestly I have no idea what you are talking about. "Logos" really don't exist. You can make your own using 3ds software, that is it.
Buildings you have to make your own using the 3ds software above.
With Pathways and rides you can make your own, or you can use the ones found here: http://www.coastersims.com/norestraint.asp?action=viewarticle&articleid=121&page=1 (make sure to read TOS).
Hope that helps.