@DianaMB333 I know you've popped in on a few threads but just curious, do you have a specific weekend you're aiming for? You mentioned spring, so Springtime Surprise would be the obvious choice if you decided to do this, but Princess is also a good option if you can pull it off. The reason I mention is because both weekends have very different race routes for their longer events. The Princess Half is a race that goes from Epcot to MK and back. The 5k is a loop around Epcot. The 10k started in Epcot and had a small section in HS.
Meanwhile… it’s hard to predict what they’ll do for Springtime Surprise next year. This year featured a 5k in AK, a 10k centered in Epcot, and a 10 miler that had an extensive loop in HS for the first time since Galaxy’s Edge and Toy Story Land opened. Worth noting: no MK. That can change (hence the surprise), but we won’t know what the themes are until sometime in the summer, hopefully before Princess registration opens, so people can make decisions based on what they prefer.