Watch the videos until there arent any videos available. Usually I can get 200 credits a day redeeming the views for credits, so if you do this everyday for 10 days you have 2,000 credits plus any surveys you do. Also do the "Ampario" and "myview" surveys, those are usually the only ones that allow for a finish without disqualification. The surveys usually only work on monday and tuesday, after that a lot of people have done them and they dont need anymore responses. Other offers like netflix etc pay out from what Ive read...
And about the EZ swing, as said above... they are VERY inaccurate. I would hit a ball with 1mph wind and it would go astray. Might as well get used to the 2nd click on normal clubs, you will need that skill when you buy better clubs with all of your 'free' credits :)