Help on how to get my act together

I need advice on activities that I can do to improve my chances on getting into a good school. I am willing to work hard, I just have not had any opportunities that interest me, although as highschool continues I realize that I need to start.

I am a highschool junior attending a small(600 student) school, I went to a different highschool for freshman and sophomore year that did not offer AP or Honors classes, and I am now in AP English Literature and Honors World History, and first semester I took Honors Algebra 2/Trig, but have since dropped the honors into regular.
GPA : 3.82
SAT(First time, last month) : 1780
C. Reading : 580
Math : 570
Writing : 630
Family Income : >$45,000
I am a female, hispanic and Alaska Native as well as caucasian
Any advice is GREATLY appreciated, I feel embaressed to set my sights even moderatly high because of my lack of extra-curriculars.
I would love to go to UCI, although I know that it is a stretch, but I also don’t want to head into applying to colleges selling myself short. I am very competent and I try very hard in school, and hopefully I can improve my chances with any support/criticism/advice I can get!

Activities are always hard because I have never been one to advocate doing activities solely for the resume. If there are no activities that interest you at your school I suggest starting a club on your own that does, it shows leadership and all that feel good jazz.

I would say for most schools one true passion is better than a million things on your resume. Try to find something you really enjoy and run WIth it. For example if you like science, try to start or join a science club at your school or see if your local college has research opportunities for high schools. If you like politics, join student government and see if your local congressman lets students intern for them.