If you love gorgeous scenery that is easy to get to, then Harry's Ridge Trail is the place to be right now! The flowers are in early peak bloom right now. Start from the St Helens observatory and start walking. The trail can be as long or short as you want it to be. The full trail is 7.8 miles and goes to a ridge above spirit lake. But if you are going for volcano views with flowers, you have that as soon as you hit the observatory.
Either way, I recommend headed up there soon before the heat starts to wilt the beautiful flowers.