Join Date: Jun 2009
Location: North County San Diego
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You have a ton of options with 50 mile loops. Since you'll be in La Costa, look into inland North County loops - San Pasqual Valley, Lake Wohlford Road (if you like hills) and the Valley Center area, although that may bring you a bit out of the 50-mile range.
Some roads in these areas are like mecca to me. The Woods Valley Road stretch is one of my favorites.