I'm a lowly dentist but I do know a thing or two about facial trauma. During my residency the ER called me first when somebody got bashed, I checked it out and called the surgeon with a full report. He of course did the heavy lifting but I scrubbed in and assisted on the cases which was cool.
The bottom line is, the Zygomatic-Maxillary Complex is your cheek bone and together with some other bones forms the floor of your orbit. In its already fragile state, another bash could result in some pretty unsavory outcomes, most notably entrapment of the extra-ocular muscles and consequent double vision which could be permanent.
Count's probably right, the water in most mountain creeks and headwater rivers has a pretty low fecal bacteria count, but I wouldn't take the chance with infection either.
Listen to your doctor and everyone else and enjoy something chill for a spell. You'll have plenty of time to get back after it.
And as far as full face goes, don't scrimp. Sweet Rocker.
I hope in the future Americans are thought of as a warlike, vicious people, because I bet a lot of high schools would pick "Americans" as their mascot. -Jack Handy