I am cruising on The Jewel of the Seas at the end of June to the Baltics and only want to take pound sterling and euros with me for quick drinks on land and for souveniers. Will these currencies by suitable or will I have to take various different currencies with me as the euro is not the standard currency for these countries? Also what climate temperature can I expect. Most importantly how do I stand sneaking in my case a couple of bottles of wine?