Which section of the great wall would you recommend us visiting. My husband and I are both seniors

My
husband and I are both seniors age 66 & 67 years old. Which section do you recommend for us to see? Also is there a tram to take us up there and back or do we need to hike up many many steps? Also, is it cheaper to book reservations for the Wall in China or in the US? Thank you, Debbie