First up, it's a reservoir/lake, not a "sea," and a taxi to get there from downtown Tbilisi shouldn't set you back more than 10 GEL.
Situated in the Sea District, it's where many locals head to to cool off during the hot summer months. It also makes for a great place to stroll around, ramble around or enjoy watersports at, with the Tbilisi Sea Club there to entertain you.
The beaches in summer are crowded and controled by lifeguards.
While in the area, be sure to check out the Chronicle of Georgia for some mysterious Georgian history.
Hungry? Heady to the pricy but stunning Tbilisi Yacht Club-Restaurant La Cote.
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