I was thinking about the bears. I don't think I can find the spray here in Spain but it will be a thing to buy wen I arrive to USA. Any more recomendations about bears? Are they so common? I only saw one from the distance in my previous trips to USA. About the weather. I suppose I can find all sort of temperatures in this trip. This is why I think it is better start in the south and finish north. I think I will need 4 weeks. I can choose start early or mid May, what do you recommend? Thanks for the link!