Day 6 was a high-stress day.  We had to re-fuel and return the rental car in Pisa by 10:30 am.

This was the breakfast room at Hotel La Locanda.  When I chose the hotel and the 10:30 am return time for the rental car, I did not know their breakfast was only served starting at 8 am. Hotel La Locanda's breakfast was typical Italian buffet: coffee, juice, pastries, fruit, yogurt, meat, and cheese.
We refueled the car at a service area on the highway then returned the car to the Pisa Airport (stressful but we got it done).  We then took a bus to the Pisa train station (1.20 euros [$1.30]), stored our bags at the left luggage office for 8 euros ($9), and walked to the Leaning Tower.  It was the hottest day of our trip, and the crowds were large, but it was so fun! Just me with the tower!  (When I was last here in 2001, the tower was closed to climbing, but it can now be climbed.  We did not.)
The Leaning Tower is actually the bell tower for Pisa's Duomo (Cathedral). For lunch in Pisa, we got a too-large portion of fries (for 6 euros [$6.60]) and ate them on a shady bench on the main drag.  So fun!
We walked back to the train station, picked up our bags, and took the next train to Lucca (30 minutes, 3.40 euros [$3.75]).  The train was delayed but comfortable and air-conditioned! Our hotel in Lucca, Hotel Rex, was right next to the train station.  We went and checked in and took a siesta.  I paid 89 euros ($101, including the tax) for the night.  Our room was a strange configuration: a kid area and the bathroom on the bottom floor, and the adult beds on a second floor.  Hot air rises, so even with air conditioning, the temperature on the top floor only got to 76 F after 12 hours of having the air-conditioning on.  It was no fun.
I made the mistake of asking our hotel for their loaner bikes around 4:30 pm.  It was still 95+ F outside.  The first bike I got had a flat tire.  We started out to bike Lucca's historic walls, but it was too hot, and we sat under a tree for an hour, enjoying the breeze and the people-watching.  We did eventually make it all the way around. We had enjoyed our two nights in a row of hand-made pasta, so we asked the man at the front desk for a recommendation for dinner.  He gave us two.  We went and read both menus and ended up at La Tana dell'Orco (a.k.a. Claudio's).  It is a local family restaurant with the atmosphere of an American Mexican restaurant.  I kept waiting to be served chips and salsa.  We had a great time!
I had the tortelli lucchesi (ravioli with meat sauce)--a classic American flavor a long way from home.  It was so good! My mother had her favorite, the margherita pizza, and said it was also very good.
   
After dinner, we went out walking inside the walls.  Tons of people were out!  It was fun to see.  We got gelato, too.