Basically your asking where can I make a little extra money with what I already have. Most of that answer will have to come from you and what you have and if you have the ability to do it yourself. Usually and especially on a small operation to make any profit at whatever you're going to do you will have to do it yourself. I'll list the things that are working for US.
Gas or minerals lease
Lease pond out for Crawfishing
Lease pond out for duck hunting.
Cut extra hay off of pond to sell.
Sell any extra hay we may have for that year.
Lease on a monthly basis a right of way to a landowner located behind us.
Lease a spot for a cellular site.
Occasionally cut hay or other jobs with my equipment to people that doesn't have access to machinery.
Lease out the area where we ween calves to others that may not have the facilities to do it, we have pens, shelters, automatic feeders and water and really good fences.
We sell deer corn in bulk out of our bins.
I will give you a piece of advice on leasing rights of ways. In my previous life one of my jobs was a project manager for construction of gas transmission lines, so I know the other side of the fence in this area. If a company wants to purchase a right of way across your property, take it to an attorney that has lots of experience in doing just that kind of work. Don't settle for X amount for them to cross your land, make them pay an annual fee and have that fee tied to cpi.
Hope this gives you some ideas.
Good luck and Merry Christmas