Day hikes are possible from the Naro Moru Gate. This is especially for those with botanical interests as you can see the Afro-Alpine vegetation of Dendrosencio and Lobelia above the tree line. Best to get a vehicle to drive you until the Met Station. A guide is compulsory. Weather can be unpredictable. On the south side, Castle Forest Lodge (see sleep section) has a couple of short guided hiking options. On the north side, Camp Old Moses is a possible start and/or end point (though not necessarily worth the US$52 entrance fee).
Ngare Ndare is known for its blue pools and waterfall - reserve ahead of time to ensure a guide is available to take you there (due to wild animals, you can't just go by yourself). It's either a 1-hour hike with an armed guard or a 4x4 drive with an unarmed guide from the 'office' under the canopy walk. There is also an elevated walkway (canopy walk) which is best done close to dawn/dusk when birds are active.