Add punctuation: The canoe trip is approximately 5 km long after which you will have a delightful wilderness dinner with some grilled salmon by the fire
A: The canoe trip is approximately 5 km long, after which you will have a delightful wilderness dinner with some grilled salmon by the fire.

Add punctuation: 2 adjustable front feet 2 rear rollers wall spacer
A: 2 adjustable front feet, 2 rear rollers, wall spacer

Add punctuation: This makes many people much of the excess weight
A:
This makes many people much of the excess weight.