Lone Star Flight Museum offers rides in several of its aircraft, notably the B-17, B-25, T-6, and PT-17. The flights aren't cheap, but very high in 'bang for the buck'. Many veterans and their families visit LSFM regularly to experience the flights - some to remember times past, others to experience what their fathers knew.
I found this video on Youtube - I have no idea who shot it, but it's pretty neat.
If you are in the Galveston/Houston area, a visit to the museum is highly recommended. Check their website to see if your visit would coincide with one of their designated 'ride' days - if it does, I think it would be well worth your time and money to go up in one of these grand old birds.
(BTW - I've flown in the B-17 and B-25 - it's a hoot!)