May is not a great time for rock yet; I would doubt you can get into Forbidden easily either. Weather is also less stable this time of year so that would dictate my climbs. If N Ridge of Baker is a goal I would do a steep snow climb, then a steep snow with glacier climb, then that one. You could do all those on/around Baker. That said, weather could just be junk too so you might do the first two on Hood or another volcano. For alpine rock I would look at the Stuart Range as access can be better this time of year and it will be drier than N Cascades (still a hike).