Sweden is a pretty country, with a lovely (albeit very flat) coastline in the south and beautiful mountains in the north. The north is covered in waterfalls, the south in fields and wildflowers.
To my knowledge, there ain't a whole helluvalot in Sweden as far as monuments. Most people come for the scenery, as far as I can tell.
Not surprisingly, given its latitude, Sweden gets extremely cold in the winter, and gets a great deal of snow. In the summer, it can be reasonably warm, but the weather is unpredictable, and it is often overcast or rainy.
Many people think that all of Scandinavia is insanely expensive. While this is certainly true for Norway, it is not necessarily true for the rest of Scandinavia. Sweden, for example, is about the same as the UK or France as far as expense. It ain't cheap, but it doesn't make your eyes bug out when you see the price of a simple lunch.
One thing that makes Sweden -- and in fact all of Scandinavia -- very cheap is what they call "every man's right," which says, basically, that you can camp virtually ANYWHERE, for one night. Even on private property, as long as you are more than 150m from a person's house and don't disturb anything (so don't squash somebody's crops), you can camp anywhere you want. I have taken advantage of this quite a bit, and it has saved me a tremendous amount of money in accommodation.
I had some great Italian food when a friend's parents took me out to dinner, but I haven't had any uniquely "Swedish" food. Pizza in Sweden is very flat, and is generally meant for one person only (one person with a big appetite, I might add). Somebody commented to me that Swedish food tends to be very sweet, and when I thought about it, that seems to be true. They seem to like to put Pineapple on everything from pizza to pasta (you can tell what I've eaten most of the time in Sweden). The average convenience store has a huge candy section, with literally dozens of bulk candy bins. Supposedly, they also eat a lot of fish, but I haven't really noticed it in any sort of budget food places.
I've generally found people in Sweden to be friendly and helpful, but it is certainly not true that everybody here speaks English. Most younger people have studied it in school and will understand you if you speak slowly, but many older people do not speak a single word of English. Many others, of course, are quite fluent.
Sweden is a very clean place. Even in the cities, I have seen very little trash in the streets. Along the highways there are discards here and there, but it's minimal in comparison to many countries. I camped or stayed with friends most of the time, so I can't say a lot about accommodation, but what I did see was pretty clean.
Sweden is flat in the south and very hilly in the north. That's about it, really.
Swedish roads are generally good in the south, but in the north there aren't very many people, so there's not as much time and money spent building or repairing roads. In the north, you can ride on pretty much any road (there generally is only one road from any point A to any point B), but in the south it can be maddening to try to find a road on which you are allowed to ride a bike. Bike paths just end abruptly with no direction, and cyclable roads suddenly turn into motorways.