Kayaks would be fun along with UTV but UTV stays home more of a headache and worry to haul it for how much you would probably use it. (Save on gas mpg too) Kayaks might be doable but like said above if you got a spot yu think of going Dillon Reservoir for instance call ahead to see if they hafe any to rent. CO and doing some of the easier mountain passes would probably a fun/good time. I70 anymore though just scares me not because of the drive but one accident and you are sitting in a parking lot. I still love CO but have seriously considered started thinking about exploring WY.