Non academic career for PhD in Biology
There have actually been some studies (if I recall Mike The Mad Biologist's blog covered them awhile back) suggesting that biology graduate students are somewhat less happy than their peers because many of the specialized skills they pick up aren't immediately transferrable. For some aspects of "biology" this isn't true - for example, a mathematical biologist is likely just as qualified to exit into a quantitative field as an applied mathematics student, some fields of biology involve code, etc.

Failing that, some other options colleagues who are biologists have pursued:


Government positions. Some of these are "academia-lite", some of them are markedly different, but there are several branches of government that hire biologists in some form.
Teaching at the high school level. You're likely overqualified, but that's not a bad thing, and there are private high schools that very much value "X% of our faculty have PhDs..." as something to tell parents.
As you mention knowing exist already, there are biotech companies that exist, and employ biologists in many capacities.
Conservation organizations, private foundations, etc. may be of interest, especially if you're more ecology oriented.
Depending on your research area, what you did, etc. you may be able to brand yourself as a "data scientist" - at the moment it's pretty vague as to what exactly that means.
Science communication - university offices that do outreach, news organizations, etc.
With the addition of an MLS, a career as a research librarian is also potentially an option.