An excellent, short day-hike - roundtrip took us 1.5 hours (including a decent amount of time near Spirit Lake).
Trail was in good shape - water run-off had carved through the middle of it in parts, and there were some rocks to navigate close to the lake, but overall it's easy to traverse. Bugs weren't bad (some buzzing around during the first half of the hike).
Trail starts off going downhill and levels off close to the lake. Views were great (even if the clouds were blocking some of St. Helens), and we only came across maybe 10 other people the entire time (no one was down at the bottom). The climb back up makes you sweat, but considering it is relatively short, it's not bad at all.