Quite a few Super 8's have in room safes. They charge $1.50 a night for their use.

There's more than the metric speedometer and import issues, you will have issues trying to sell a Canadian car in California due to their emissions laws - it would have to have 50 state certification and it would have to pass a smog check prior to sale. Sell it in Vancouver and hop a flight to LA to go on to Hawaii.

Some legal issues - you may want to apply for a multiple entry visa due to the nature and length of your trip. If you plan on living in Hawaii, you are going to have to jump through hoops anyway. The standard visa waiver program will not be sufficient.