Alcohol is definitely something to avoid as a replacement, it's a nasty drug too remember.
Bring your own beverage with you, some nice fruit juices or whatever you like. There'll be safe members of your family so stick with them.
Think about the sea air and how good that will be for you, take a moment every now and again to pause and appreciate it and be conscious of how good you are feeling.
Check in here when you need to, we'll be around and most importantly, enjoy yourself. You can do this.