There are a few things that I would recommend before you get that bimini:
First on my list is the
Sailing rudder, about $23. Best value and excellent handling enhancement. This is a "must have" for the Adventure (in all cases) and any kayak you may want to sail. A nice improvement for any of the boats though, regardless. It really increases the rudder's authority, especially at slow speeds and requires much less rudder correction to hold course.
The Hobie standard fins are the most durable of all and work fine. If you want to improve performance, either the
ST or ST Turbo Fins are more efficient and will enhance performance significantly at the higher speeds and when accelerating. Turbos are the most popular but not for everyone. ST's are easier to push, easier to install and more economical. Personally I love to go fast and prefer the Turbos. My wife likes the STs. Maybe you can demo them first. The local dealer here keeps a demonstration set of each.
A
cart makes getting your boat in the water sooo much easier. I prefer the standard cart -- trouble free, rugged, less expensive than the Trax cart and suitable for all terrain except soft sand. In that case the Trax is nice. Some handy forum members have made a cart out of PVC and wheels from Harbor Freight or the local hardware store. I use the Hobie cart and love it. I load all equipment on the boat, make one trip to the water roll the boat right in and then remove the wheels (they float). The reverse happens coming out. This is a great labor and time saver.
A forth item I find indispensable is the
i-comfort seat pad. Not everybody needs it, but this makes a huge difference in comfort for me and I'm completely spoiled by it. I use it 100% of the time no matter what kayak I'm in.
Although there is nothing wrong or deficient with the standard Hobie equipment, IMO these upgrades make a significant improvement in each of their areas -- handling, performance, transportation and comfort -- and therefore in your kayaking experience. Beyond those four items, it really depends on what activities you may wish to pursue and/or your personal tastes. Have fun shopping!