Don’t take this wrong the wrong way. Not assuming your as old as me. But at our age you may want to use a program like P90x or the 5 minute trainer. Only using them as reference for examples. They are a least programs that are easy to follow and stick to.
Being involved as an athlete/coach for over 30yrs. Doubt I could get myself in the right shape without following a good program, or without of the use of a trainer. So that things are designed for gains. Rather than a hap hazardous of things here and there.
Hardest thing is going to be sticking to what ever plan you choose to follow. The aches and pains, the time involved. All make it real easy to fall of the wagon. Becomes a mental thing. When I was still lifting a few years back. Would come home from working barely able to get out of the truck. Would drag myself to the weight room. Within 20mins of being there would feel better than all day. Real tough to get there some days though.
Realistically cardio is going to be the biggest to work on for that terrain. Then general strength training for the whole body. Being sure to work the core. Called that for a reason! In the time you have. Keep in mind that depending of your age, and current fitness level. A 30% increase in overall fitness is going to be on the high side. Perhaps a bit more, or less. Push too hard though and you will burn out. Not hard enough you will not peak properly.
Lastly, test your self before starting. So you know where you end up at the end. Even again midway through to see where your at. That’s enough before I start talking anaerobic/aerobic thresholds.
Good luck. I hope you have a great hunt.