Come on over to Moving Up for your primary help and Q&A source.
"A wizard is never late, nor is he early. He arrives precisely when he means to."
Most likely have a Halo 3 multiplayer marathon, perhaps forge a new map on there. I liked Halo Reach, but I think it's a mess now and there's too many reasons for me to say why, so it's Halo 3 for me. I do still have a LOT of faith in 343i for Halo 4, but I think they ruined Reach.
[Edited on 07.01.2012 4:15 PM PDT]