http://biglaketaxiandlimo.com/services_3.html
I would second your partner driving you to C&J in Dover (exit 9 off the Spaulding, left turn at the lights, and about a quarter to half mile on the left.). Good range of times leaving Dover.
Here is their website
http://www.ridecj.com/
Or as mentioned, Concord Coach.
We use Concord coach...no tolls, free parking. However C&J has more trips.