One of the most popular day trips from Tbilisi is Kazbegi. Famous for its amazing mountain views, this sleepy little village close to the Russian border attracts many tourists from all around the country. But reserve some days on your Georgia itinerary as this place is definitely worth more than just a day trip. If it would have been up to me I would have extend my trip to Kazbegi with a couple more days, but unfortunately I had no time left. It was simply fantastic though!