You can catch the Dart trains take them to the outskirds or take TRE over to Fort Worth.
If you look up there in this form, there's a "Texas Rides" sticky, and I posted a link to Dallas bike route maps that'll let you get around pretty good by bike in town.
Some of the routes closer to me go out East Fork Road and around the Mesquite airport, if you care to look them up.
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"be careful this rando stuff is addictive and dan's the 'pusher'."