Okay, I've got a bunch of thoughts....
1. There are lots of bodies that will do fine with landscape photos. Unlike your D3s which is superb for sports or photojournalism, with landscapes you can afford to take your time, meter, shoot multiple versions, use a tripod and a long exposure to compensate for a body that doesn't do ISO64000. So frankly, you could go with almost any body (including a D90) and with the right accessories, get good results. Here are some details to consider.
2. You said you've got a good tripod. For good landscape photography you really want a great tripod. Maybe that is what you've got. You need something you don't mind hiking with for 8 miles. Something that is rock solid (even with a stiff wind). Something that will be stable on uneven ground. If your tripod does these things, you're in great shape. If it could hold a D3s and keep it stable, it's probably a good tripod.
3. You will need some filters. A GND for shooting long sunsets/sunrises and a set of (or an adjustable) NDF for when you need a long exposure in bright light (like shooting a waterfall or a beach setting).
4. You need the right lens. Frankly, I think the Nikkor 35mm f1.8DX is a good landscape lens. Wide angle enough for you to shoot buildings in the city or landscape that is close by (while still fitting it all in), very small and lightweight, sturdy and amazingly inexpensive (I think I got mine new for $180).
5. Some kind of wireless trigger or release is invaluable for long exposures.
6. Last thought--you said you like to hike. I'd look seriously at the Nikon D3XXX series and the D5XXX series. First, they're Nikon (and you're used to Nikon). Second, they're good budget cameras. Third (and critical for a hiker), they don't have an autofocus motor in the body (they rely on the lens having an autofocus motor). This means the bodies are smaller and much lighter than, say, a D7000 and especially when compared to a D3s. You may not have minded the size and weight of the D3s. But if you're going to hike a lot, you want a camera that is easy to get to (or even something you could tuck in to a fleece pocket so it's more accessible if an unexpected shot appears).