I had spare money at the end of the month I definitely would love to go sightseeing.
If I had more money I would like to buy some math books, booked more lessons in Italki and also to buy new headphones.
We don't see the questions, so I'm guessing...
If I had spare money ..., I would have gone sightseeing.
If I had more money, I would have bought books and headphones, and also have booked a package of lessons here on iTalki.