The first question is, what do you consider average?
You do realize that absolutely everyone in your class is significantly "above average", and many of them won't make it through, don't you?
That is not to say that your attitude is wrong. It is good to be confident, just not too confident.
Your class standing might affect your orders, but you never know who needs people and when.
If you want to see a lot of foreign ports, you have to go surface. A boomer won't do a lot of port calls. Attack boats (the REAL submarines) don't spend a lot of time in interesting ports either. In fact, the whole point of nuclear powered ships is that they can stay at sea for ridiculously long periods of time. Basically, if it has a reactor it ain't a cruise ship.
You never know. Some of the guys here have been to a lot of ports. Some of us did almost none. Four years at sea on attack boats - I went to two foreign ports during one med cruise. One of those was LaMaddelena, so it hardly counts.
If you are intent on seeing a lot of interesting places, try Royal Caribbean. Being a nuke only guarantees that you will spend a lot of time in the engine house.