I usually have the same set of holidays in all my saves. Except for the default ones I have two that involves traveling to other worlds and I especially enjoy them. One is Summer Day in the first week of summer (I play on 14 days schedule) and it only has two traditions go on vacation and water fun - destination is Sulani. My sims go there to rental lot and basically do everything that island offers. They book for two, max three days so nobody gets bored. Another one is BBQ Day at the end of summer. Destination is Granite Falls no surprise. My sims go camping and traditions I choose is go on vacation, tell stories, interact with fire and grill. They also spent there around 3 days, that’s why both of these holidays I set on Friday so they can have “long weekend” lol. Usually holiday in Granite Falls turns out much more pleasant than Sulani one as they just chill by the fire and tell ghost stories, even toddlers have fun. And Sulani is more like a grind to check out all the activities. Except for that I make Halloween too, but nothing really special about it. I don’t put anything more because I want holidays to be rare occasions and I don’t want to be annoyed by them.