Benchmade, ESEE, Kabar, SOG, Condor and many others make some good knives that would fit your needs in the outdoors. I like the Condor Golok machete for woods use if I am going to be cutting stuff on a regular basis. The Kabar Cutlass machete is also a pretty cool blade as is the Ontario 12" machete. Kabar Beckers would fit your needs.
I have some big knives, but I tend to lean toward fixed blades in the 4-6" range. SOG Seal Pup Elite would be a good general purpose fixed blade for the woods. You might even carry it in a small town on your belt. But honestly, I will use a folder 10x as much.
As you probably gathered, carrying really big knives concealed is generally an invitation to law enforcement interest if you are not out in the woods.