Don't really know where group rides meet up, as I ride alone and live out east of Allen/McKinney (on Lake Lavon)---So, I don't have to drive to the roads. I see lots of cyclists out in my area that come from Richarson/Plano/Allen (according to Strava Flybys). I spent most of my time riding on the roads north-east of McKinney. Its easy to get 40-100 miles between McKinney/Melissa/Anna/Blue Ridge/Farmersville. You can go farther north and/or east as desired.
For solo rides in the area, I'm sure you could park at the Princeton Walmart on US380 and ride out from there. Jump to the north of 380 and start turning randomly.
New Hope Rd
FM 2933
will get you into the area I'm talking about. From there you can explore.
Stay clear of 121, and FM545. Most of the county roads are pretty good. The area around CR338 is a pretty nice detour from FM2933.
For solo rides in the area, I'm sure you could park at the Princeton Walmart on US380 and ride out from there. Jump to the north of 380 and start turning randomly.
New Hope Rd
FM 2933
will get you into the area I'm talking about. From there you can explore.
Stay clear of 121, and FM545. Most of the county roads are pretty good. The area around CR338 is a pretty nice detour from FM2933.