A few non-comprehensive Leavenworth suggestions for 5.10- climbers:
Single Pitch:
Clem's Holler: favorite 5.9/10 sport area at Leavenworth (that I've been to), also one worthwhile trad route. Lots of multipitch sport routes, but they can all be done first-pitch only.
Classic Crack and Dogleg Crack are both 5.8+ trad and close to the road. Most people agree with the + part (hint: if you have small hands, it is much easier to lead Classic than TR it)
Pearly Gates: one of my favorite 5.8/5.9 trad areas. Especially if it's hot out because it's in the shade until afternoon, which is pretty rare for LW.
Hobo Gulch: quite a few mostly-bolted-bring-a-couple-cams routes in the 10- range. Watch out for hornets.
Multipitch:
Givler's Crack: easy 5.7, but lots of fun
Condorphamine Addiction: 6p 10b bolted slab.
Careno Crag Regular Route: (the crux is on the first pitch, slab climbing on gear)
Duty Dome, Straight Street: 5.9+ (the 9+ part is the bolted first pitch, I think the second trad pitch is easier, wasn't really paying attention because it started raining)
(lots of other stuff at Duty Dome)
(and of course there's Outer Space and Orbit, but I still haven't had a chance to get on those so I can't give a personal recommendation!)