1. They decided to have the best vacation ever, so they flew first-class, took taxis everywhere, stayed in a four-star hotel, and ate at the most expensive restaurants. They pulled out all the stops.
2. Our only daughter is getting married. Since it’s something that happens only once, we’re going to pull out all the stops : a big wedding with flowers everywhere and a sit-down dinner for 500 people.

Compare to: whole hog; whole nine yards; to the hilt; go to town. The origin of the expression is that in playing an organ, the organist gets the maximum sound from the instrument by pulling out all the stops on the keyboard.