Advice: Only attend these types of programs if they interest you. Do not try to pad your resume because admissions boards can see through that. Both my sons attended leadership seminars regarding national security, junior war college, and aviation. They loved every minute of it, were totally engaged in the topics and came away with alot of new experiences and information. Yes, they are expensive, and it was worth it for my kids because that was interesting to them and when we look back at their 'resumes' it makes sense.
But there were many programs that we said 'no' to.
Throughout High School, do the things that you are passionate about, step out of your safety zone, but create a resume that makes sense for you.