TWO QUESTIONS & I may be stupid, but my Pioneer in another car that I have is so easy.

I find that I can't just put in a Name for instance of a hotel say because I don't have an address, and I live in Spain and a postal code is not an individual house/hotel or whatever, the postal address in Spain is the Town so can anybody tell me how to get over this Please ?

The other questions is if I want to do a scenic route how do I plot this in the GPS, just as a waypoint, followed by another or ?