3-4 nights near Buenos Aires

I’m going to Antarctica next year and I’ll be spending 3 nights in February beforehand with the tour group in Buenos Aires. I have an extra 3-4 nights to work with. Do you have any favorite weekend trips, day trips or hotels in or within a few hours of Buenos Aires? Nature, food and safety are my biggest priorities. This trip is already pretty expensive so not looking for anything else that’s crazy expensive.

I have never been to Buenos Aires or Argentina. I’m going with my mom and she hasn’t been there in 40 years.

Thanks for any ideas you can give!