If he's inexperienced leading on trad rock, you will likely find yourself always on the sharp end. That can be really fun, but don't underestimate the impact of being on point all day, including making all the route finding choices. That probably won't matter since as others have pointed out, most alpine rock around here won't be in condition during your visit. The volcanos often offer crampon hiking with serious consequences and rare moments of terror: What's that whooshing sound? Why are my legs dangling in space? Oh no, I put my helmet down on it's top, when will it stop sliding? Stuff like that.
If you want a good Forbidden Peak adventure, consider the North Ridge rather than the west. More glacier travel, you'll circumnavigate the peak, you'll probably be out 2 nights early season, and it'll be pretty wild and lonely. Downside might be the last few pitches; though moderate rock, it may present some challenge if all snowed up.
Peruse the trip reports here, you'll find a lot of info on many possible objectives. Hope you both have a great time.