Move west only after the mountain return is complete
Use three nights in Tbilisi, two in Stepantsminda, two in Kutaisi and two in Batumi. Return from the mountains to Tbilisi before travelling west. This keeps weather delay away from the rail journey and gives each base at least one useful full day.
In Kutaisi, choose Gelati or one cave or canyon, not several distant sites. For Batumi, keep day nine flexible: the botanical garden suits good conditions, while the old centre, market and museums work in rain.
Read every station and transfer
Tbilisi Central and Batumi Central are clear rail points. Kutaisi is more complicated, so identify Kutaisi I, Rioni, the city coach stop or airport before booking. Batumi Central still needs a local transfer to the waterfront.
Choose rooms after checking the real arrival points. Kutaisi I, Rioni, the city coach stops and the airport are not one place, while Batumi Central still needs a local transfer to the waterfront. Keeping these last journeys visible prevents a cheap room from creating an awkward late arrival.
With eight days, remove Kutaisi or Batumi. Do not save time by turning Stepantsminda into a rushed day trip. The example total excludes private mountain drivers, regional tours and airport transfers.