Translation of activista

I hope you could understand my last letter to you. You see, when I write in Spanish I am not very confident. I always question myself and each and every sentence takes about fifteen minutes.
I just saw the Arsenal match. It was very boring and the atmosphere in the stadium was weak. I think that it was mainly due to the cold and not due to the quality of the game. But it was worth it.
The Lagoon Explorer had only room for eight passengers and crew. We were really excited once we saw the boat, as it looked beautiful. There was a couple from D.C. which also booked the same boat.