Took the train to Monaco and walked around the harbor and then up to the palace which was high up on a hill overlooking both sides of Monaco.
There were fantastic views from the palace grounds and we took 100s of photos as usual. Had lunch out of a grocery store and headed back to Nice pretty early.
We didn't have enough coins to buy two train tickets since the machines didn't take bills so Kate rode free and they never checked tickets. The train only takes about 15 minutes between Nice and Monaco.
In Monaco there are public elevators that go up to the top of the cliffs.