My wife and plan to be at crater lake July 4th weekend for two nights. We plan to take the boat tour of the lake but we're trying to decide if want to do the island stop. We'd like to find out more about what there is to do on the island and what facilities, etc there are. We are mid fifties in decent shape but not real experienced hikers. Are the restroom facilities and anywhere fir food or drink. What about shelter if needed due to storm?