Would have about 8-10 hours in Tallinn before making way over to Helsinki. Have heard you can knock out the city in a day. Any recs? Thanks!
The old town is indeed compact and very walkable--be warned, each little twisty lane leads to another that looks even more enchanting! Alexander Nevsky cathedral can be toured, the lookout from the top of Toompea hill affords a lovely view. Spend a few hours exploring and perhaps have lunch at a restaurant on the square, then you might take tram #3 to Kadriorg park, about 10 minutes from the stop at the edge of old town--lovely little palace and gardens, a lake, and if you enjoy museums the KUMU is well worth a visit. I first visited in 2013 and will be there again for a few days in early May, this time I want to explore a couple of revitalized industrial areas, Rotermann Quarter and Telliskivi.
Thanks...looking forward to it!
If you don't have Rick's coverage of Tallinn (in the Scandinavia guidebook or the 3-city Snapshot book, you can get started with sightseeing summaries at https://www.ricksteves.com/europe/estonia/tallinn.