Intense workouts are probably not the way to go on the first run after two weeks.
Just to give you an idea of what I do:
We go out on the road for a 16-20 minute run (depending on your pace of course), about 2.5 miles at 7.5-8 minute mile pace. Then we come back and do dynamic stretches, such as:
Loose arm skipping (forward, left, right)
Crossovers (left, right)
High knees for about 20m, slowly increasing the speed and then jogging for about 20m
Same as above but with kickbacks
Slow high knees
Sideways with a clap (left, right) - work the shoulders as much as possible, all about the height
Forward and backward lunges
3-4 30m strides, but remember to slow down gradually
Some people do static stretching but I don't think it should be done really, only after the warm down.
Then we do the session, today it was 3 x 600m/200m with 1 min rest between reps and 8 mins rest between sets (so a bit faster than the winter stuff). Then a 1-2 mile warm down, nice and gently, so you don't get cramp, preferably with your warm clothing on. Then a bit of static stretching.
As for your tight calves, have you tried ice baths?