Hi,
Your son is definately not bored at his young age. Is he mobile in someway??? (rolling over one or both ways)?? He would be able to entertain himself and find toys if he's able to be mobile in anyway.
Otherwise, make sure he's getting adequate sleep. All babies require a diifferent amount of sleep. Generally speaking. When he wakes up in the morning and after breakfast more than likely he will be tired for a morning nap around 9ish. He'll take a bit of a nap, then wake up and play or go on an outing. Have lunch around noon or 12:30pm then down for afternoon nap around 1pm again. Wake up around 3pm and play until dinner and bedtome routine and down by 7pm. A routine something like that makes for a very happy and well-rested baby.
Just a quick hint, and coming from experience. With our first child I spent so much time with her and she talked early and had all her needs taken care of. To this day she's 5 years and has trouble playing on her own and needs a lot of attention because that's what I conditioned her for since she was a baby. I have three children and my other two play so well on their own. My oldest is learning how to play on her own because I force her to have quiet alont play time or younger sister gets her to play with her. She'll choose to play or talk with adults though even when kids are around. Just something I've learned along the way.
Teething could very likely be the other reason for the crying and being uncomfortable. I've found that those bath letters/numbers are great biters for baby because they are that softer foam feeling material.
Anyways, don't worry so much. Playing with baby can get monotonous at times but blocking play times and making a schedule for mom to go by kind of helps mom deal with things to do and breaking up the day a bit.
Hope everything goes well, and it's amazing the things we learn as parents as our babies grow into toddlers and toddlers into children, etc..... it's defiantely a journey.
Take Care, L.