A surprising number of trails are market out in that area….and the mappage is quite reasonable really….
But, as richc pointed out, many of the good rides are p2p….some of the longer descents specifically……you could easily waste a day just road climbing to the top of some of the rides above the national pk….
My advice would be to drop Marko a line at Ciclo Montana….those guys are super accommodating and will hook you up with some quality day guiding/shuttles no problems (if they have room!) for very a reasonable cost….
It’s certainly an area where local knowledge is worth the investment!!