I have lived near Portland, OR, for years and never heard of the museum of advertising. Wow! It sounds very interesting.
My favorite museum was a little one in Sorrento on the edge of town. I think it is Correale di Terranova Museum. It is listed in Frommer's guide book. It is an old villa, several stories high. Has a wonderful collection of old clocks, fans, photographic equipment, and several paintings. I just loved it. Hardly anyone was visiting when I was there in October last year. There is a nice garden there at the back of the villa and I ended up in the gardens of a closed hotel and had wonderful views of the sea. Hardly anyone in our tour group found the museum as they were off to Capri.
Miriam - Oregon