I had an enjoyable ride to Top of the Bagel in Carlsbad, going along the San Luis River bike trail (the northern part of the ride on the route map below) which is nice because it's about 7 miles long with smooth pavement and no stops. The bagels at Top of the Bagel were really good. I'm only giving it 4 stars though because they only had Pepsi products. The chocolate chip bagels were dairy free so it's another good choice besides Einstein Bros Bagels in Carlsbad.
Bagel Rides Progress -- Miles: 1200, Bagels: 28