So I booked 4 days in Carlsbad in September on a whim to celebrate a birthday. Other than brunch at Grand Traditions and a birthday dinner at Chart House in Cardiff (any opinions on that too?) we don't have plans. We are two middle-aged adults and like historic/sight-seeing tours or other educational type events. We are find hanging around the pool and walking the beach for part of it, but need a little entertainment planned. I'm debating San Diego zoo, and I have ruled out Catalina due to the time commitment, but would love other ideas or activities. Thank you so much for any suggestions!