Sri Lanka sits close enough to South India that it barely registers as a long-haul international trip, yet the island fits ancient rock fortresses, tea-country hill stations, and a full coastline into a landmass smaller than Tamil Nadu.
Direct flights connect Chennai and Bengaluru to Colombo in under two hours. Indian nationals apply for an electronic travel authorization online before departure — it's a short form, and approval typically comes through well before the flight if you apply a few days ahead rather than the night before.
Sigiriya Rock Fortress, a 5th-century palace built atop a 200-metre rock outcrop, is the single most photographed site in the country and worth the early climb before the heat and the tour groups build up. The Dambulla cave temples, with centuries of Buddhist murals and statues carved into the rock, pair naturally with it as a half-day add-on.
The hill country is a different trip entirely — Kandy's Temple of the Tooth Relic, then the train ride from Kandy to Ella, often called one of the most scenic rail journeys anywhere, cutting through tea estates and past waterfalls for most of its length. Nuwara Eliya adds the colonial hill-station climate and a working tea factory or two if you want to see how the leaf you're drinking gets there.
On the coast, Galle Fort's Dutch-era ramparts and quiet boutique streets are worth a full day, and from there it's a short run down to Mirissa or Bentota depending on whether you want a surf-and-whale-watching base or a calmer swimming beach. A six to seven night trip covers all three regions comfortably without feeling like a checklist, and the flight time and visa process cost about as much planning as a domestic hill-station trip would.