as someone who learned to fly in california...I would spend some of my time out that way. the weather is pretty darn good and there are MOUNTAINS that might interest you...places like Lake Tahoe/Truckee, Mono lake and others are CHALLENGING places to fly.
You might want to get some hours of instruction in mountainous terrain flying.
As an airline pilot I flew to Florida alot...just not my cup of tea.
75 hours could easily fly you around the whole darn country.
When I was building time (circa middle 1970s), I put all my cross country time together (building for commercial) and flew between San Francisco and Chicago...VFR only. Very worthwhile for me and something I still think of now a days.
don't just buzz around...go somewhere...BUT WE DO THINGS DIFFERENTLY in the USA than the UK, so get some really good instruction before you head out alone.
And if you go mountain flying, have a plane that is more powerful than you think you need.
So, take a chart, think about going from somewhere to somewhere.
BUT NOVEMBER is the time the wx goes down many places. Some of the best wx in the US is the end of sept/october.
Also, you might want to learn how to do an uncontrolled airport entry...fly over at 2000', look down at pattern markers, segmented circle, and windsock/indicator, and learn how to enter from overhead...a lost art.
the US has LOTS of planes flying around so if you are not moving your head around looking for traffic...you are asking for trouble.
keep your landing light on for traffic avoidance!