[SBC] Revised Tour de Somerville route

[Ron Newman]

Doris, Enid, and I did a practice ride this morning, and decided to  
make some small changes to the route.

1) At the end of Vernon Street, instead of proceeding straight onto  
Pembroke, we'll turn right on Central St,  cross the bridge, and then  
turn right into the Cambridge Health Alliance parking lot, where we  
can talk about the new park the city plans to build there next  
year.   (Hopefully we'll learn enough at Wednesday's meeting so that  
we can say something intelligent about this.)   Then we'll leave the  
parking lot, turn left onto Central, recross the bridge, and turn  
right onto Pembroke.

2) Enid and Doris thought that the end of the ride was too indirect,  
and I was surprised to find ourselves going uphill on Powderhouse  
Blvd. to Packard.  So we cut out that part of the route.  Instead  
we'll exit the Powderhouse rotary onto *Broadway*, then turn left on  
Simpson Ave, cross Holland St onto Jay St, left on Howard St, right  
on Thorndike St, left on the Community Path (Linear Park) back to  
Seven Hills Park.
(We could have picked any of Wallace St, Irving St, or Simpson Ave.    
I chose Simpson because it's the flattest.)

Unless anyone wants further changes in the next day or two, I'll  
prepare the final map for copying.