rent of canoe)is PLN 8 per hour and PLN 28 per whole day (in eur it's 2,5 and 8 respectively) - the place I recommend is called "Pod Debem" - under the Oak. It's at the very end of the village NIDA (south from Ruciane). There's a restaurant, camping site, rent of yahts, canoe etc.
I love eating fish, and where's a better place than at the lakes? You get there lots of kind of local polish fish, such as pstrag (trout if im correct), wegorz, lin, sielawa, szczupak, whatever else i dont remember... Fish costs EUR 2-3 per 100 gram, usual piece is 200-300 gram, and some french fries go with it.
This is where you will find a timeschedule of the ship cruises coming from Mikolajki, Ruciane, and around. It can be just a tour around the nearest lake, or it can take you to another town and you may stay there. You will experience the unforgettable atmosphere pictures in the polish film "REJS" :))
Few years ago there was a very sudden storm on the mazurian lakes, yahts were fallen, and unfortunatelly there was a number of people who died... so please be careful with the weather when you're on the lake. In the morning there's bright sunshine, but in few hours the wheather can change and there can be a thunderstorm... when you see dark clouds approaching, don't wait just go to the shore asap. Please!
in general if you want to stay one night the price of the room will go up 30% so if the "normal" price is PLN 30, then you will need to pay PLN 50 for the same room if its just a one night, because obviously the work for house owners is the same (cleaning and bedsheets change).
That's one of the most popular mazurian resorts... the local goverment offering variety of attractions to tourists, such as exploring an old factory of PVC or whatever it was before... the test says "PRIVATE KEEP OFF" I havent entered as I spent time at the lake, but I would have with pleasure! The factory seems to be totally distroyed and aparted.