Occasionally, I see programs that look fascinating but have an activity level that is higher than I usually enjoy. Should I attend the program and try to challenge myself or play it safe?
I'd say it also depends on whether it's just a higher level than you "enjoy" or if it's a higher level than you think you're capable of. It affects the experience of the others if someone on the trip is visibly struggling and delaying the schedule because they can't keep up reasonably well. That's one reason why we carefully slant our trips to the more active ones while we're still able to do them comfortably!