The Remix is made in 3 sizes 59, 69 & 79. The 79 is rated up to 280 lbs...
Check out this sizing chart by Colorado Kayak Supply, Kayaks, Kayak Accessories, Gear, Fishing Equipment, Kayaking Accessory
Chart: Sizing Chart
It has all the sizing information for all the current models of Dagger, Jackson, Liquidlogic, Pyranha, Wavesport and Bliss Stick kayaks.
The Remix is a great boat for what you are looking to do, but you may want to consider something that is a little smaller, like a Jackson Fun. It is still a very beginner friendly boat, but will give you the option to surf waves and learn freestyle moves as well. IMO learning in a playboat will improve your skills faster.