Thanks for all the advice! I'm going to try and measure my cadence fairly soon so I can get a feel for if I should be pedaling faster (which I'm sure I should be).
When I took my bike out Sunday, I noticed immediately that the saddle just doesn't feel comfortable and I plan on switching it out; I noticed a lot of people saying that about the Trek 7000 series. After my ride, there wasn't really any burn in my legs but a little bit of soreness, probably from the day before. My legs are a little stiff today but overall feel pretty good so we'll see how tonight's ride treats me.
Once again, thanks for all the advice and I'll try to apply it in my riding.