I did the hike to Teneriffe Falls back in March when it was much cooler, which I appreciated because the trail is uncovered for much of the way up to the falls. At the time, the parking lot at the Teneriffe trailhead was packed so we made our way from the Si lot instead–it added on an extra 3 miles round trip, but made for a nice warm-up/cooldown. You are required to hang a Discover Pass on your dashboard at both the Mount Si and Teneriffe parking lots, so prepare for that when you plan your hike. This hike is 6 miles round trip, with an elevation gain of almost 1500 feet. While not exactly Mailbox, Teneriffe boasts its fair share of rocky terrain, especially near then end towards the falls. It also has what feels like endless switchbacks, although the views along the way make up for it. The end of the trail is clearly less maintained than the first couple of miles, so watch where you step because it can be slippery (at least, it was in March!) and gets worse as you get closer to the waterfall. Teneriffe Falls is gorgeous–it makes the list of my Top 10 Favorite Waterfall Hikes! I looked up at crystal clear water cascading down a sheer rock wall and just felt utterly small–I would 100% recommend this hike to anyone, and am looking forward to going again in the future!