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.