Not face the Patriots.
Not face the AFC East, period
Fun fact: Peyton's 3 playoff wins came against the AFC West (Denver twice, KC) which isn't known for playoff success (post-Elway's retirement, the AFC West is 4-8 in the playoffs, with all 4 wins coming from Oakland) while 4 of his 5 losses have come against the East (Pats twice, NY, Miami).
Conclusion: In order for Peyton to win the Super Bowl, he needs to only play AFC West teams in the playoffs, and then have the SB be in a dome. Of course, that doesn't factor in how good the NFC champion will be.