Stay there all the time ... home away from home ... love it!!
as stated above, you can fish in the lake, they rent poles. (not sure about bringing your own but I assume you could call and ask.
The fees? They have a resort fee of $8 or $10 per day and then the standard taxes, other than that there are other fee's if you plan on using a tube in the lazy river or playing mini golf, but they have packages for those charges as well.
When you check in, they will try to goat you into a sales pitch, you can politely tell them No thanks and they will never bother you again, no phone calls, no knocks on the door ... nothing!
There is a back road into Disney, Sherberth Rd., off of 192 which puts you onto Disney Property right by Animal Kingdom and AK Lodge.