be wary
Be wary of street vendors promising free tickets to theme parks. Generally found along Cavill Mall in Surfers Paradise, they promise free theme park tickets in return for 3-4 hours of your time watching a timeshare presentation followed by high pressure salesmanship to sign up.
Many legitimate vendors sell discounted theme park tickets. Check out the tourist information booths run by Gold Coast Tourism Corporation (http://www.visitgoldcoast.com).