If you have a fence maybe run it along the fence. Try and build it nice. Throw a railing on top, maybe stain the sides the same color as the fence. Don't leave rails and other shit all over the yard.
Idk, I remember it took almost a year to convince my parents to let me and my sister get a trampoline. In the end had 3 trampolines side by side in the backyard, a 12' wide miniramp in the driveway and an 8 foot wide in the garage.
I think they realized I needed something to do living in the middle of nowhere. Also I paid for everything myself including the tools. I don't think I would have been able to just do it all at once but they were just sort of like whatever. At least I wasn't smoking rocks.