i walked around most of the perimeter trails there w/ my gf, its pretty easy for sure. even the hardest trail there was maybe 3/10. great for an easy scenic walk in the woods and you get to chill on some cool rocks. you can easily shorten or lengthen the hike depending on how much time you have because its a big trail network, but you can't get lost no matter how hard you try.
i did the diez vistas trail a week ago, first hour was 8/10 difficulty, then 5/10 for the rest. ran it in about 2 hours, recommend it for hikers who want a safe trail (no scrambling, easy route finding) but are up for a bit of a physical challenge.