I used below code in local.xml to add the cms block at the end of the product content, but it will push the right sidebar down (2columns-right is the template)!
<catalog_product_view>
<reference name="content">
<block type="cms/block" name="product-page-carousel" as="product-page-carousel" after="-">
<action method="setBlockId"><block_id>product-page-carousel</block_id></action>
</block>
</reference>
</catalog_product_view>