The walk to Spoodles is probably like 15 minutes. The boat ride is normally longer, but it is a nice relaxing ride.
If you plan on walking follow the path outside the Studios with the water to your left and the parking lot on your right. This path will then proceed down away from the parking lot but the water will always be on your left. Just keep going and you will soon reach the outskirts of the Boardwalk Resort. Walk around the Boardwalk Resort and you will come to Spoodles, which is a few doors away from the hotel.