You ought to go to Silent Cartographer and kill a bunch of marines in a single spot, lather rinse repeat a few times, park as many warthogs as you want on top of the leftover grenades.
Now you can just lob a grenade underneath the hog(s) and watch them fly like a field goal over a designated spot (the arch being one of the best); or you can lob a grenade under a hog (towards the back end of it), jump towards the windshield, and as it flies towards you back-end towards, quickly flip it and get catapulted really really high. Bonus points if you survive.
The classic was definitely more worth it than the skulls for the sequels. The fruits of your labor is definitely more worth it than grabbing a convenient skull that adjusts physics a tad.
EDIT:
If I remember correctly, apparently the windshields on warthogs won't hurt you at all, and you can harmlessly go flying; however, the fall may kill you. This is one of the most fun methods to get on top of the level. Which you can also crouch-jump off a Covenant crate to a small dip in a canyon wall as you head towards the main door switch (or the big lid). But that way is more frustrating. However, if you manage to land a warthog atop the level, have fun. More bonus points if all 3 of them.
Been ages since I played the classic Halo, and I still remember that. I wish my XBOX worked and I had some people to play against. The PC version is okay, but meh, not the same feel. Especially when mapping a 360 controller for the PC doesn't line up with the classic controls. A lack of black and white buttons is a bit of a bother, but being unable to L3/R3 on it is even more annoying.
ADDED NOTE:
I got many bonus points (survival from launching from hog to arch, having all 3 hogs on top of the level, landing a 360/720 off the top of a structure. Getting maximum output of nades for launching without hacks, The list goes on. That was my favorite level (especially on Heroic when not launching cars. Not too easy, not too hard; plenty fun.) of the game outside "The Maw" on Legendary.)