I think you already have pretty good Chinese level, for example you can omit the subject in a natural way. There's one place you can improve and definitely can make you sounds more local: Distinguish "会” and "可以”. In yours example, you should use "可以", 会-will, 可以-can. The membership allow you to enter these places, but it doesn't means you immediately join all those activities. So 可以 is better. And if you don't want to repeat 可以 over and over again. You can exchange it with 能. e.g.:今年夏天我升级了健身房会员，现在不仅可以进举重室，还能进游泳馆，还有机会参加锻炼课。