I live in Marlborough and mostly fish the Sudbury Resevoir. Lots of great shore access(It's actually shore fishing only), especially if you take the time to walk all the way around it.
I gotta agree on the tick thing though. My daughter has had two ticks in the past month, I've had one, and I've found numerous on my clothes. Seriously tick central.
That being said, I've caught some good size fish there.
Here's a 3lb'er I caught last summer
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Beyond that I sometimes head over to Heards Pond in Sudbury, Fort Meadow next to the Picky and just started checking out Lake Boon over in Stow/Hudson. I really gotta head over the Wachusett one of the these days.