Are you a running a majority campaign or minority one? Majority campaigns rely upon educating the majority of people to support you in theory, whether or not they do it explicitly. If you have 70% support you will be limited in the tactics you can choose (militant rallies chanting, “1 2 3 4 Poverty is Class War, 5 6 7 8 Organize to Smash the State” are definitely out – vandalism might be out too). However, you will also have a better chance of winning. The alternative is to mobilize a small group of really committed people and rely upon the neutrality or apathy of the masses. A minority could exert substantial pressure by occupying a building, sitting in trees threatened with logging, or holding weekly protests which cause your target to negotiate (and/or give-in) just to get rid of you. Generally majority campaigns are best. You can keep your supporters on your side, even if you all get arrested, if you effectively communicate how important your issue is.
In what environment will the tactics be used? (conservative, liberal, apathetic) If you are trying something that violates rules, how tolerant are the security or police? What happened the last time your organization (or another one) tried this tactic?
Be creative.