I have gone to the Mary's Peak outdoor range many times over the course of the last year and I have a blast every time.
There is plenty of room for everyone to shoot and there is often other people shooting here too. It would be useful to take note that there are multiple areas where one can shoot.
If the weather is not too brutal, Mary's Peak is an awesome alternative, and it's free!
EDIT: it is now 2 years or so later and the trash/casings up there are abundant.. PLEASE if you go up there clean up after yourselves! Do your part and clean up after yourselves, we're all big boys and girls here.