ok. the web server does some header checks (this checks for accept-header request). If not set, it repsonds with a 403.
Try:
<CFHTTP URL="https://www.crowneplaza.com/hotels" METHOD="GET" timeout="5">
<cfhttpparam name="accept" type="header" value="*/*">
</CFHTTP>
<cfdump var="#cfhttp#">