I don't have any firm travel plans yet for 2016 and I'm obviously starting to have travel-withdrawal, since I spent the morning poring over at the RS tours for 2016. I found 3 tours that appeal to me and fit my budget. Each trip would likely be 14 days.
- May 23-31 Tallinn to Saint Petersburg 9 days. I'd fly to Moscow for about 4 nights on my own, then fly to Tallinn to join the tour.
- May 22 - June 2 Bulgaria 12 days. Probably fly to Sofia 2 days before the tour, stay 1 night (maybe 3) after the tour.
- Oct 10-23 Athens & the Heart of Greece 14 days.
I've been to Tallinn, Helsinki and Petersburg briefly on a Baltic cruise. Since then, I've very much wanted to go back to Russia for more Petersburg and to see Moscow. I don't have any friends interested in Russia and I don't really want to be all alone in Petersburg, though I think I can handle Moscow solo for 4-5 days.
Bulgaria sounds both interesting and scenic. While I'd have no trouble spending a few days solo in Sofia, I think I'd enjoy seeing other places too and I wouldn't do that on my own.
It's ridiculous but I've never been to Greece.
The above dates are the only ones that work for me,