My two friends and I have rented an apartment in Florence. We have not been in Florence for thirty years. I would appreciate an unique experiences or suggestions, besides the normal tourist attactions? Any recommendations on side trips and restaurants?
Start here At a Glance
https://www.ricksteves.com/europe/italy/florence
Also look thru the towns nearby-Siena, Pisa, Lucca, Tuscan hilltowns etc
https://www.ricksteves.com/europe/italy
See these ideas: https://community.ricksteves.com/travel-forum/italy/favorites-in-florence
Also, now I'd add to these to read up on the '66 flood and to seek out the many flood markers. I particularly enjoyed reading Diary of Florence in Flood by Kathrine Taylor and watching youtube videos of the flood.
Oh, and I thought I would hate the natural history museum, but actually I loved it. I didn't look at the anatomical models, though.
There was a restaurant in Fiesole where we ate in 1985 named Le Lancia that I think has reopened-it had a wonderful view of Florence. You should also consider doing a food tour-I think the one we did in 2019 was Walks of Italy
.... besides the normal tourist attractions?
It might help to know which attractions you saw 30 years ago? As well, what sorts of attractions do you enjoy, and what time of year will you be going? You don't mention how long you were in Florence last time so we don't know how much ground you covered previously. Help us out here?
There are attractions on many visitors' lists but that doesn't mean they're 'touristy'. There are many good reasons for people to flock to them.