Hi Billy, glad you decided to return to cycling and to join us here at BF. You should post your questions about the bike you are looking at and, your budget, in say, the Hybrid Forum to start. Those members that participate there can tell you about the disk brake bikes available now. You might also want to read a bit in the Clydesdale and Athena Forum, those folks are super friendly and can steer you to what works for them (200+ males and 150+ females.) Modern bikes above the box store, "Bike Shaped Objects", level, have very capable frame sets as far as their strength, regardless of the frame material. At your budget level it will most likely be aluminum, these are fine frame sets. Rim brakes, when they are setup properly aren't scary to use or maintain, its the low quality level brake sets and department store "set-up" that has the brakes set incorrectly. Fit of the bike is the most important aspect of the bike for its comfort on longer rides and the forums can help you with doing this, a good Local Bike Shop is the place for this to happen. Best of luck on your search and enjoy the family vacation.

Bill