Hi Sam,
It seems to me that #3 (watching TV) may be quite helpful once you know Hebrew enough to follow conversations.
Between #1 and #2, it's up to anyone's inclination. Some learn better from cassettes/CDs, while others learn better from live classes.

BTW, you may get along fairly well in Israel speaking English only, but please don't be discouraged from your wish to learn Hebrew, it has its' own merits.