Ask HN: What would you do with 7 extra days in Warsaw? Other airports ok

Hi HN, I've gotten some good travel suggestions from here before (thank you for the US national park advice!) so thought I'd ask again as I'm feeling a bit stumped. Solo female traveler for context. I have a business trip to Warsaw in September and am able to go a week early. I can fly into nearby or other airports. I'm feeling a little uninspired so all suggestions welcome. Option 1: Fly into Helsinki, take the ferry to Tallinn, rent a car through Baltic Net car rentals that does 1-way rentals from Tallinn to Warsaw and then drive to Riga, Lithuania and then Warsaw. Option 2: Fly into Berlin, see Berlin, then drive to Leipzip, Dresden, Prague, Wroclaw, Lodz and then Warsaw. Option 3: Other suggestions?? I've already seen Copenhagen, Krakow, the salt mine, Auschwitz, Budapest and Zagreb so don't want to revisit those. Feeling a little intimidated to do the Helsinki/Tallinn/Riga/Lithuania route solo. I'm pretty adventurous but for some reason that makes me a little nervous. Any thoughts/suggestions? Thank you for any ideas!