I have always liked to watch myself masturbate. I take my penis in hand and it gets harder and harder and I love to sit for long periods stroking it. I can have a good session watching myself in mirror from various angles also.
During the past several years, I have taken pictures of myself with hard-on and looking at myself on computer screen with semi-hard-on or hard-on will help me stay hard and have a more intense ejaculation.
Regarding doing it in a hotel, I very much like that also. When younger, I was on the road a lot and in one town, where I visited often, I had a friend who lived at the motel and had a special suite for himself. He subscribed to a lot of Nudist magazines and we always got together when I was in town and we stayed in adjoining suites with adjoining door. I would be lounging in his room looking at the many nudist pictures, while getting hard. He would walk around naked, practicing nudism. We would both be aroused before going out to get women for the evening. I would go to my room for shower and he would shower. I am sure he masturbated a lot as I did. I would get terrific ejaculations after seeing all of the nudist pictures. Sometimes I would masturbate three to six times a night.