One trail feature I enjoy, but don’t see as much these days, is the good old fashioned log stack. Log stacks are generally pretty easy to negotiate, but you never know what’s on the other side, which makes good positioning crucial, especially for tall stacks.
A close second is the huck (for lack of a better term.) Basically any flat surface that launches the rider straight out as the ground falls away below. Again, not a feature you see often but it’s oh-so fun because you can really carry some speed into one. That is, as long as there is an appropriate landing zone. 🙂