Plan your trip in advance. Summer vacations are crowded, but the weather is best. There are a lot of areas in Yellowstone to see geysers. Get a map and designate in what order you want to see them.
Pack a good pair of hiking shoes! To see many of the geysers you have to hike trails.
Go to the Old Faithful area. Old Faithful is the most famous geyser in the world and a truly remarkable experience.
Visit the Norris Geyser Basin in Yellowstone. This area contains the hottest geyser in the park. It also has the tallest geyser in the world in Steamboat Geyser (it can reach 380 feet when it erupts). Unfortunately, it does not erupt regularly with up to twenty year gaps in between blasts.
Take your binoculars. You will get to see small details up close and personal. You may even get to get a peek at the wildlife that made Yellowstone famous.
Keep Yellowstone clean! Do not throw trash on the ground and make sure to take anything with you that you brought. There are trash bins ****tered throughout the park, so there is no reason not to use them.