Maybe also suggestions or random features on the front page? That could lead in to the discover page.
Run through "top hikes" sites for ideas on what to add yourself and build up your content. I was a bit surprised not to find more; you could build a starting list and then knock off adding 10-20 each night for a week and get your numbers up.
I've also found some arbitrary rankings or suggestions can be a good way to find the most special experiences. If photos are the only method of discovery, everyone ends up in Monument Valley and miss Arches when it should be the other way around.
This site (http://besthike.com/) is ugly but isn't a terrible way to get ideas of new hikes to research. I've found a few through that site which I've really enjoyed (TMB, Huashan, TLG, etc).