Very flat and wide enough to accommodate both bikers and walkers. There are 2 trails, one on either side of the river but the wide dirt "lower" trail is trafficked by horses so proceed with caution. Trail says it is not open until 7am but when we showed up the gate wasn't locked.
A great ride in Albuquerque. Start at the parking lot at Alameda Blvd and the river. Ride it to "The End of Albuquerque" and back. The ride is flat but scenic. Boxing Bear Brewing is a half-mile from where you parked -- a nice way to finish the day.
This is a great trail. Crowded on the weekends, but still great. Saturday and Sundays, swing by Bike-In Coffee (take the I-40 east bike path just south of the freeway) for food and coffee. Flying Star on Rio Grande (just south of Montano) is another good midway point.