Run like hell.

Your mad panic sustains you for several hundred yards, until you pleasantly find that your sense of direction is better than you thought it was and you've wound up at your hotel.

Unfortunately, you less than pleasantly find that you're just as out of condition as you ever were and spend the next five minutes catching your breath while leaning against a wall for support.

You can:

Stride confidently into the hotel and go straight to your room.

Ask the people at the desk to store the painting in a safety deposit box.

Take a seat inside and examine the painting in a good light.

Stagger to the bar and demand alcohol.