I like happy endings too. So let's see I would end it with that JR runs Ewing Oil and Bobby Southfork.
Pam would return home. She was kidnapped by Katherine from the hospital and didn't want to leave her family. It was Katherine who wrote the goodbye letter sent to Bobby. When Bobby finds out the truth he forgives Pam and they are reunited. Christopher is more conflicted at first but then happy to have his mom back.
Cliff would reunite with Afton and they would raise Pamela Rebecca together. He would also retire from the oil business. Maybe go back to law or into politics.
I would have prefer for James and Michelle to end up together too. I am not crazy about the Debra Lynn and Jimmy plot. Also John Ross stays at Southfork.
Miss Ellie and Clayton would return home to Southfork after travelling the world.
Lucy would return too for a visit. Married and expecting her first child. Maybe she's re-married to Mitch or someone else that we've never seen before.
Sue Ellen & Don, Donna, Andrew & Margaret, Ray, Jenna, Charlie & Lucas would also stop by for a visit. Maybe Jenna and Ray could have another child together, that is younger than Lucas.
Also maybe Val, Gary and the twins would also show up for a visit.
Basically I would gather people around Southfork for a huge family party. It could be for Bobby and Pam's wedding if they would get remarried again. The show then ends as it began.