Answer:
1 Jack his brother, and I are going hiking and fishing this weekend.
2 We had wanted to go to the beach, but we couldn't get hotel accommodations.
3 We decided to go to the mountains instead, and enjoy the cooler weather.
4 We'll probably hike for a few days, and then we'll relax by fishing at the local lake.
5 We'll take food sleeping bags, a few changes of clothes but little else.
6 Would you like to come along, or are you busy this weekend?