The only comment I have is that it is a lot of driving in one day from the Dambulla (Cultural Triangle) area, through Kandy, to Ella or Dickwella. However, the scenery will be pretty nice, especially going through the hill country. One option is to go by road from the Cultural Triangle area, spend a night in Kandy, and then take a Cinnamon air flight from Kandy to the southeastern coast.

Cinnamon air has a flight from Kandy (Polgolla) to Weerawilla, which is close to Yala, and onto Dickwella, which is about 30 minutes west of Tangalle, and then finally to Koggala, which is 30 minutes from Galle. In December 2017 I took this flight from Polgolla to Koggala and thought the $175 I paid for the 1.5 hour flight was totally worth it. The drive from Kandy to Galle would have taken the whole day. The day we took the flight there were no passengers getting off at Dickwella. So it was Polgolla to Weerawilla, and on to Koggala.