The rate at the moment has been hovering around 1.20- 1.21 for a few weeks now. If Greece decides to leave the Eurozone can we expect the tourist rate to jump, or would it drop considerably.
"Even translated to English that isn't a very helpful comment."
Maybe not, but it's pretty accurate.
As Squad says the Drachma (for want of a better name) would devalue by at least 50%, but the OP asked about Euro rates not Drachma rates. If Greece pulls out, the Euro might leap due to release from the drag, or it might plunge in expectation of others following. Nobody knows.