Please excuse if this is old news.
I have read on various occasions in other parts of this site, suggestions as to how to acquire a few extra miles in a hurry to obtain the next level etc.
I was recently on vacation in Florida, and as purely a social flyer was coming up 180 miles short, with no further chances this year.
I booked for myself and my wife Tampa to Sarasota return. This is operated by Cape Air in a nine seater Cessna. 20 minutes each way. Per mile, obviously quite expensive, but as a one off experience, absolutely superb. My wife was ushered into the co-pilots seat on the return journey and enjoyed it enormously.
Highly recomended.