Baja in the Summer is way too hot. January and February are fine. We were there in March/April: too hot.
2) Its been a few years, when I last was there the gas stations all had regular instead of unleaded, and the dispensing spouts were too thick to fit automobile filler pipes, and we had to scrounge a funnel.
3) We stayed in motels except for one night out (which was in a city park). Didn't feel all that safe in a foreign country.
4) Food was excellent, we always bought from outdoor vendor carts and lunch wagons.
5) Grab some cheap used photo books on Baja on Amazon to get into the mood.
6) For some strange reason their sunscreen did not work. I would bring my own trusted brand. The sun will burn there way more than in the States.
7) There are ferries across the gulf to the mainland, they don't leave every day, ask AAA for schedule.