When blog book tours first became popular, they popped from city to city online, rather than live. That convention soon disappeared when bloggers realized there was no necessity to be tied to physical locations.
Now we rarely know the location of a blog that is hosting a tour stop. Still there is a sense of place that can really add to a blog book tour stop if it's utilized well. One of my favorite examples is at Steve Prosapio's blog.
In a recent series of book reviews, he interviewed authors at real locations with photos to give us serious atmosphere. It was new and cool again. So if the book you're reviewing is very "place" oriented, think about creating this sort of ambience with words and pictures. A strong sense of location could make for a very interesting tour stop.