Work with what you already have. That's a great camera, a true classic. The lens is equally great too, allowing you to shoot from wide to telephoto. I know the tele isn't that much as most would prefer it to be but when shooting as a tourist you'll be wanting to get as much of the scene as possible meaning you will be using wide more often than not. Even when you're shooting people, you will want the background in there.
You won't see me lugging around a tripod all across Europe but if you think you can, why not? It will be summer so you'll have lots of light during the daytime. I imagine the tripod will be useful at night when taking long exposure shots? Maybe the Aurora Borealis if ever?
Filters? Just make sure your lens has a UV on at most times (take it off during long exposure at night) and maybe some ND (104, 108) for waterfalls and sunsets. For other effects, go the safer way, do it in the computer.