Now that I'm a bit older, and narrower in the saddle, I prefer beach cruiser style bikes to traditional road bikes and mountain bikes. Traditional bikes tend to hit my pelvic bones or isches wrong.

And my favorite (so far) is the Townie by Electra. I sit more naturally, it has a wider seat to help with long distance soreness, it's affordable and uses easily found replacement parts. I have smooth tires with Mr. Tuffy as opposed to Slime for puncture resistance.

You feel it on the hills if trying to push, and the flat foot position means the seat is farther back so it takes an adjustment to get used to standing in the pedals and staying as balanced as on a traditional stance bike.

But my wife and I could routinely do 20 miles with no soreness or pain.