There is a lot of great advice here, and it is all dependent on the level of comfort you need and the amount of risk you are willing to carry.
One of the first keys of investing is to always bill yourself first. What this means is take out money for a 401k or other investments before you pay anything off. By treating your investments like a mandatory bill, you are much more likely to start accumulating and being able to invest. Once you are able to invest you start getting passive income. Passive income is the key to accumulating wealth.
So in your example of using funds or stocks, pick ones with dividends and have the dividends go into a savings fund. This fund becomes your hunting fund. You can also buy a rental property but the numbers are much trickery to explain in a post and there is some risk in the event that it goes without a tenant. But essentially someone else is paying for your equity. You can also buy bonds instead of stocks, the nice thing about this is even though there is a lower rate of return you dont have to worry about the ups and downs, and treasury direct will automatically collect from a checking account.
To me and this is just me, debt needs to be manageable but should not be the biggest consideration of financial freedom. If you are maxing out your 401k and have 6 months of reserves in savings, it doesn't matter if you have some credit card debt or car payments, you have the reserves to weather the storm if one should come up.
If you had old stuff you dont use, sell it, you buy new furniture, sell the old, use that money for tip money. The little things you can do add up.
You have to reward yourself, life is too short. Sounds like you are being responsible, dont be so focus on getting x amount by 50 that you miss ride. I would say pick a hunt you want to do now and do a 50/50 savings split on investing and hunt fund. You get to 75% of hunt amount, book it for 18 months out.
Also, keep in mind, hunt prices tend to go up, so picking a number now and then buying it 2 years later plan to pay more. For example, I saved 8 years for a sheep hunt, when the time came, I was still short as prices have gone up.
Also, definitely plan on the wife tax, just take 10% of safari cost and buy her something nice. She will be happy when you book a hunt.