I'm with ya man. Don't listen to these folks. 90 miles is a chore on that bike stock. But pretty soon, you'll understand why they are laughing!
1) Believe it or not, over time, you'll be more comfortable on your bike anyway, you'll build up new muscles (it's true!)
2) Get a new seat. Don't waste your time or your money on seat covers. They improve, but not enough. Mustang Wide Touring is fantastic. I went from sore after 40 miles to being able to ride tank-to-tank effortlessly.
3) Highway pegs are a must. Moving your legs around is a necessity. Also, keeping your legs stretched out will help your hind end feel better!
4) Get off the dang interstate! It's boring as all get out, LOL.
5) Don't use the term 'cruise control'. It's a throttle lock and it's a pet peeve of mine when people call throttle locks cruise control. Cruise control maintains speed, not throttle
You can go the throttle lock route, but I have had tremendous success (Just got done with a 600 mile trip on my 900, 2500 mile trip last year) with a 'cramp buster'. It's this little plastic thing that wraps around your throttle and allows you to change hand positions.
Get the 'CB2', the wide one. It's wonderful!
Have fun! The 900 is a great touring machine once you get it configured right!
You don't specify what bike you have in your post, but assuming, from reading other replies, that you have a 900, I don't think you have enough "bike" for your size. If you intend on much open road riding, you should probably consider something with a larger frame, and larger eigine.. Something deliberately designed for that [B]typeof riding. You would be much happier all around. The 900 is great for general purpose rides and short jaunts. Not so great for larger folks or [B]long rides. Been there. That's why I upgraded to the Nomad model. Same reasons as yours. It all depends on your riding styles, which only you can determine. Take care.
The frame on the 900 is nearly the size of the 1700 models, it's just not as heavy! I'm a big guy, and I ride it two up long distances loaded down with luggage!
That was one of the best things Kawasaki did with the 900; they took a mid-sized bike that's cheap and cheap on insurance, and put it into a big frame capable of doing a lot more!
Not saying there aren't trade-offs. Or that the 900 is the best bike ever. BUT; I and others have no problems with lots of long distance riding on our 9's! I've ridden a 1700 Voyager. Suspension was better, it was smoother, better wind protection, lower RPM's; but it really didn't feel any 'bigger' (other than being heavier). My feet felt like they were in the same spot as before, as were my hands!
So, no doubt a Nomad is a better touring machine; but I wouldn't tell OP to just give up and jump ship just yet. With a few tweaks the 900 is very capable.