Rafting and paragliding adventures can be had within an hour or two's drive of the city, and you can indulge in the Old Town's traditional steam baths any day.
Georgia’s many rivers provide exciting runs for rafters of all levels. The season is from late April to mid-October (best until July on most rivers). A half-day trip with a one-to-1½-hour run on the Mtiuletis Aragvi or Pshavis Aragvi north of Tbilisi, suitable for beginners and up, typically costs 40 GEL per person for four or more people, plus 100 GEL to 150 GEL per group for transport. There are also challenges for experienced rafters on the Mtkvari River near Borjomi and Vardzia, and the Rioni River in western Georgia (June to November).
Any time of year is good for the unique experience of a traditional bath at Tbilisi’s famed, steaming sulphur baths. There are several bathhouses to choose from. None could be described as modern or luxurious, but if you don't fancy the idea of stripping off among strangers at an inexpensive men's or women's public bath, most bathhouses also offer private rooms of various sizes with their own pools.
Abano No 5, said to be the oldest at around 300 years, has typical public baths but also a couple of decent private rooms. The fancier Royal Bath has mosaic-domed private rooms only, and helpful Russian-speaking attendants (plus tea and beer). The popular and reasonably priced Orbeliani Baths, with their impressive blue-tile facade and both public and private rooms, were closed for renovations at the time of writing but are always worth checking out.