Selenium Can't Click Specific Checkbox

Hi guys okay so I am a relative (read: complete) newbie to Selenium / Java / HTML so apologies if I am asking the obvious. What I need is to be able to a) click on Specific Checkbox 1 and b) if Specific Checkbox 2 is checked, to uncheck it

Here is the Website HTML:

Specific Checkbox 1

<div class="checkbox">
    <label id="agree_to_terms_label" for="agree_to_terms_join" class="visible">
      <input id="agree_to_terms_join" name="agree_to_terms" type="checkbox" data-required="true" data-required-message="You need to agree to the *** Account Holder agreement" data-change="" class="parsley-validated">
      <span class="left-block"></span>
      I have read, understand and agree to the <a href="/terms-and-conditions/" target="_blank">*** Account Holder Agreement</a>
      and acknowledge <a href="/privacy-policy" target="_blank">*** Privacy Policy</a>
      <input type="hidden" name="agree_to_terms" value="yes">
    </label>
  </div>

Specific Checkbox 2:

<div class="checkbox">
    <label id="agree_to_offers_label" for="agree_to_offers" class="visible">
      <span class="left-block">
         <input id="agree_to_offers" name="agree_to_offers" type="checkbox" data-required-message="" data-change="" checked="checked" value="yes">
        <span>By joining *** you'll be notified of exclusive offers and account updates via email</span>
      </span>
    </label>
  </div>

My fruitless attempts:

Xpath:

driver.findElement(By.xpath("//input[@id='agree_to_terms_join' and @type='checkbox']")).click();

Element not visible

driver.findElement(By.xpath("//*[@id='agree_to_terms_join']/parent::label")).click();

Clicks on the href hyperlinks within the div instead

driver.findElement(By.xpath("//*[@id='agree_to_terms_label']/input")).click();

Element not visible

CSS:

driver.findElement(By.cssSelector("input[id = 'agree_to_terms_join'][type = 'checkbox']")).click();

Element not visible

by.className:

driver.findElement(By.className("checkbox")).click();

Opens hyperlinks

I had a look around the forums and saw mention of elements being hidden away - however I can't spot any iframes or anything else that appears to be hiding the bugger?

Any help would be greatly appreciated!!