People said "get a guide book ..." >> "yes!" >> I like Rick's books and will always buy one. I just bought a Lonely Planet guidebook (I don't like it's layout) and it talks about hiking trails WAY more than Rick ever does. So you may want to check one out of the library and review it.
Also, I took a trip to Spain this spring and purchased the largest scale map I could of one region. It was very good at looking at parks, vistas, etc.
I love all the museums and churches in Florence. In addition, the Boboli gardens on the south side of the river are large - they were nice - but we so tired when we got there that we didn't walk much of it.