What is my chance of getting into UC Berkeley?

SAT: 2080(CR 660, MATH 800, WRITING 620)
GPA: 4.0 unweighted ( junior yr 4.08 weighted, senior yr 4.33 weighted)
Subject Tests: 800 Chemistry, 800 Math level 2, 800 Physics
Extra curricular activities: Volunteer of National Park Service
Moderator of a Harry Potter forum online,
Assistant of a Medieval History forum online.
Math Club member 1.5 yrs
Physics Club 3 yrs(1 yr president)
Captain of Odyssey of the Mind Team for 1 yr
Chess club 1 yr
Swimming 3 yrs
Taekwondo 1 yr
Piano 7 yrs
chess (about) 5 yrs
Others: AMC 10: 114
Outstanding Student of my school every year
Chemistry club 1 yr

I would rate your chances as good, but not a shoo-in. Suggestions for improving your chances:

I agree with the other answer about dropping the geeky forum stuff.

More importantly, take the AMC12 and try to improve that score. If you could make AIME, that would certainly help.

Retake SAT. You can’t beat your math, but raising one of the other scores would be great.

I like the Park Service volunteer activity.