We will get the ROMA PASS, which is good for 3 days public transportation (as well as some of the sights). I had THOUGHT of doing the Hop On Hop Off bus. Easy sightseeing, good orientation. I noticed the HO HO bus ticket is good for 48 hours. But then it is probably an overlap of the Roma Pass. Yes?

So, my question would be -- is there a specific bus route that 'mimics' the HO HO bus route? While it wouldn't obviously have an audio guide, it would be in the interest of sightseeing (rather than just transportation).

Also -- if you buy the Roma Pass online, do they ship the packet to you? Or can I buy it on arrival at the airport? Otherwise, we have rented an apt and I might ask the agency to purchase it for us to have upon arrival.

Thanks for any help