This question is a little awkward to think about and answer because culture shock, by definition, involves four stages and covers an extended period of time so cannot be experienced on a brief touring visit. What occurs on a touring visit is more akin to cultural awareness without the "shock" factor. The "shock" in cultural exposure comes when the cultural ways begin to produce anxiety and a disturbing inability to adjust to differences creating a crisis.
This inability to adjust results in varying levels of hostility and rejection of the culture and the people. This eventually leads to a way to accommodate the differences and incorporate the differences into your own sociological understanding; sometimes this takes the form of permanent rejection of and distancing from the culture. The optimum result and opposite of rejection is involvement with the culture and a feeling of belonging.
The phases are characterized by "Excitement and Fascination," "Crisis Period [shock period]," "Adjustment Phase," and "Acceptance and Adaptation Phase." You can see, particularly from the inclusion of a "Crisis Period," that culture shock is not meant to define the momentary disorientation experienced by a visit to a different culture in a different country. And, most certainly, a visitor's cultural awareness or a new resident's culture shock can be experienced by a visit or a move, respectively, to previously unfamiliar parts of one's own country, for example, by a Californian moving to Maine or by a Mainer moving to Georgia.
Culture shock itself is an experience that can be felt with severity during the Crisis Period and requires a significant time period to fulfill because the Crisis Period--which defines the experience as "shock"--doesn't start before the second or third month and may be delayed for up to a year for very optimistic and buoyant individuals.