Remove stems from peaches. Peel top third of each peach. Using a small knife, cut around stem end and pit to loosen and remove pit, leaving bottom intact. If necessary, slice about 1/4 inch from bases of peaches so they will sit flat; brush peaches with lemon juice.
Spoon 1 tablespoon dates into cavity of each peach. Gently press 1/4 cup macaroon crumbs onto top of each peach. Place peaches in a 1 1/2-quart casserole. Cover and bake at 350° for 30 minutes or until peaches are tender. Uncover and bake an additional 8 minutes or until crumbs are golden brown.