You can try grouping items together. Ex: if you rented the same camping spot 3 times, add the expense amounts, and enter it once with the same date. Keep all receipts just in case the Canada Revenue Agency (CRA) has questions.
Also please note that there is a maximum expense limit of $1,000 as an individual or $2,000 as a family. Once you reach that limit, you will get no additional benefit from adding more expenses.