When in a hotel, I get out my portable USB drive where I keep my porn collection. I usually choose a directory for the mood I am in. One of my favorite directories is called 'Awesome' and contains pics and vids of curvy women with big tits for the most part. There are some pics of hard dicks getting a good workout too.
I lie down on the bed with my laptop at eye level propped up on a pillow. With my left hand I scroll through the pictures, stopping on those that really turn me on. With my right hand, I stroke with a small circle made by my thumb and 1st finger - lightly from just below the glans, to just above the head ridge. Usually in no time my dick starts leaking precum. Sometimes I dry off the first drops as I am still enjoying the dry and light stroking I mentioned above.
Later after precum is dripping down the head, I might start getting too close, and my precum starts to turn a little milky. At this point if I have not gone too far, I stop and let it throb. Then I dry off the head and start the process all over again.
When I am ready to cum, I get to a particularly good picture (the good ones change depending on mood), then I focus on it while I increase the circle's pressure. When I get right to the edge, I stop and just let it 'ease' over the top. Every now and then this will result in one of those mind-blowing cums that we all love!!