My serious answer for this thread is, invest in what you know and are comfortable with. It will net you the better return long term.
When I worked in South Texas lots of my colleagues invested in land and cattle. It's what they knew and they were pretty good at it. What I knew about and was comfortable with was mutual funds, and I've made what I consider a decent return on investment the past 15 years that way. Had I tried land it likely would have been a disaster, and same for them selecting mutual funds. Not to say you can't diversify, but put the bulk of savings in a vehicle you know. Branch out to something else with a small amount until you have time to get past the learning curve if you feel the need to try something new. I want to try rentals one day, but just don't have the time between work and family, so it has to wait.
As for my guess on returns, the land itself I'd expect to be an overall low return unless there is something special about it. Most returns would come from other income sources on the land. That's not experience, just my guess. Then again who knows if the next 10 years will be the 1990s or the 2000s for return in the market.