Fletch as chad said I think you need to narrow it down a bit if you are serious about doing this. The narrowing it down will probably be pretty easy. You mentioned several things
1. apparel: get that out of your head or you will just end up in retail, granted you might get pro deal, but the only side of apparel that would be remotely interesting is testing and they have sponsored athletes for that.
2. tourism: short of being a guide that probably is not as interesting as it sounds, but maybe if you can get into the right area?
3. fundraising/conservation: if you can get in with the right group (access fund, etc.) this could be a good way of going.
4. conservation/managment: let me start out by saying that I work for california state parks during the summer months as a seasonal lifeguard, and I had an ex girlfriend that was a seasonal park aid (now she is a permanent employee). If you are looking at either national or state parks there are a lot of jobs available, but the issue is they are either low paying seasonal jobs with very random hours or they are fairly specialized jobs that require some type of degree or certification. I am not saying that they are hard to get, but you must do the leg work to get your foot in the door and then advance through them. If you are supporting a family trust me when I say you do not want one of these seasonal jobs I think I made 6 grand this year and 8 last year. If on the other hand you were just looking for free room at yosemite so you could climb on your days off then collecting tolls at the entrance gate might not be that bad assuming you can handle the idiot that wants a refund because the park wasn't what he thought it was going to be so he wants his money back after spending two days there.
There is a website for federal jobshttps://www.usajobs.gov/
What part of the country are you in? Do you have a family? Are you willing to move? Travel? Do you have any special skills or degrees? Special skills could be hiking or swimming. I saw an add on that usajobs site for a person to hike the trails in the grand canyon and help people back out of the hole that they got themselves into. Minimum wage to hike the tourist trails 5 days a week. Also with any park job you will not get away from the people. You will be dealing with customer service all day long