There are three trails there one leading to White Pine Lake, another to Red Pine and yet another that didn't take you to a lake. The Red Pine is about 3.25 miles to the lake, which I measured from the parking lot to the edge of the lake as I took my Garmin. It is a hilly hike but is mostly shaded and the trail is wide and well maintained. It was in the lower 80's and we really didn't feel it -- thanks to an early start. There were a section or two where we weren't sure which way to go, however but luckily it was easy enough to figure out which way to go.
It took nearly 2 hours to reach there. While the air temperature wasn't bad, there was some significant climbs. It wasn't as bad -- or as tough as the trail to Lake Blanche and you were treated to some views of a babbling creek and even some stunning views of the canyon road. I also found myself not slipping around much up there --- either I am getting better at hiking or this trail was less rocky... take your pick.
The lake was very tranquil -- and the temperature was a bit cooler up there. While the mountains surrounding the lake weren't as impressive as Lake Blanche's, the lake's water was definitely more beautiful and it looked deep. There was a decent trail around most of the lake, but in some parts it required a bit of finesse in getting around the lake.
The trail up there also wasn't super crowded either. We did see a number of people walking it but all in all, you could go for quite a bit of time without seeing anyone. It was also safe enough that I would feel confident doing it myself.
Hopefully next time I'll venture up to White Pine Lake, which I understand is a longer, but easier hike.