Eating out in Stockholm is hellish expensive. Save up plenty of money if you want that. Everywhere else the cuisine is not that varied, (lots of fish, fish and more fish). They know how to use prawns well though. its really nice to the south of Stockholm if you like the lakes and huge forests etc. Theres a place called Emmaboda that has a very small and very cheap campsite half way between Stockholm and the south cost that if you are around that area you should definitely stay at without a doubt.
North of Stockholm towards Norway it gets a bit more hilly but nothing really worth dragging the mountain bikes for. If you want to take a bike a folding one or a cheap city type bike is best with a cheap lock to save on tram and bus charges etc. (check out the ammount of Brooks saddles they have 80 )
Overall its definitely worth going to and theres loads in Stockholm to do, you can even see Sweden’s most successful ship the Vassa 😉 There’s palaces and cafes and waterfronts etc. It is quite pricey but its worth it