One of the unmissable parts of a trip to Georgia is going to Kakheti to taste the wine of the country's foremost wine making region. In this region you can also visit Sighnaghi and the churches and castles of Telavi. You should preferably go there between May and October.
The best time for walking in Tusheti is the summer. The best months for exploring the superb countryside of this mountainous region on foot or horseback are July and August. You can get there on the road that leaves from Kakheti which is only open from June to the beginning of October.
You really must visit the famous David Gareja monastery complex. You're sure to admire the 15 monasteries of this ancient site, all surrounded by flowers. Prefer the period of May to October for exploring these exceptional sites.
In order to explore Georgia's most beautiful towns you should travel between May and October. Go and see Tbilisi, which is very lively, especially its magnificent old town, its churches, bars and cafes. There is also Stepantsminda, not far from Tsminda Sameba Church and Mount Kazbek. And there's Batumi, the summer tourist capital of the country.
If you are going to Georgia, you really should visit the troglodytic town of Vardzia. Its inhabitants have lived there forever in houses dug into the stone which gives the region its unique character. The town is a cultural symbol. You should plan to travel between May and October to visit the 119 groups of caves the town has to explore.