Assuming you did some combination of 99/41 to I-5 there and back, yes, I can see how that would be tiring. Heck, it's a tiring drive in a heated (or cooled) car...
I have a Vista Cruise, it's not a cruise control, but a throttle lock and it works fine on just this type of ride, when you need to give your right hand a break. Costs ~$20, so it's pretty affordable too. The peg lowering blocks Invader mentioned also help make longer runs more pleasant.
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