If you can't do a campus visit what are other ways to "demonstrate your interests"?

so i live in east africa and it is financially difficult for me to do any college tour. these days i have been hearing a lot about how demonstrated interest is so important and i was wondering if you can’t tour the college what other things can you do to show you are interested in a school? keep in mind that as an international i can’t do early admissions at some schools. thanks in advance

http://talk.collegeconfidential.com/college-admissions/1626043-ways-to-show-a-high-level-of-applicants-interest.html

thank you so much