I know someone who might do this, but I wonder if a Howl-O-Scream Ultimate Insider Tour would be too much after having blood drawn. Heck, I sometimes grey out slightly on Alpengeist, believe it or not. I wouldn't want any friend of mine to pass out (or anyone for that matter).
Do any experienced blood donors have tips for going to Busch Gardens after such a thing? Is either Alpengeist or a seven hour tour advisable, or will water alone do the trick for some (for revitalization)?