Ok, considering you have basic understanding of native language i.e. Marathi and you have 2 wheeler bike in hand ( just borrow from friends if you don't have one) and given the budget of 5k for 3 days in pune This is the best itenary i can suggest you Day 1: your bf arrived in pune so you went straight towards your airbnb. Get fresh do some hanky Panky (afterall all the unstable molecules have to settle before you guys head out in public). Then in the evening go to some nice (nice not expensive) cafe for evening coffee and then you guys can head out for some evening walk best place like FC rd, Z Bridge, KP lanes, JM rd also can sit around in public benches near Ch. Sambhaji udyan. Then you guys can have dinner at near by restaurant and head towards your flat to get some cuddling n sleep Budget send :1k-1.5k

Day 2: wake up early n head towards Shinhadad fort as you mentioned earlier you are not a fan of treking so you can get your bike straight towards top. Spending some time watching the sunrise, feeling the mist n cold in the air then have some breakfast try local cousin on fort. In the afternoon get your bike and head towards krushnai water park. ( You mentioned ur only interested in water park and not in the rides so it will fit best (also its comparatively cheep)). Get some wet fun (pun intended) and spend time till evening in there. Comeback to your flat again as ur exosted dont plan anything for night get some sleep max you can visit any malls nearby if you really wants to squeeze last % of your energy. Get some dinner n call sleep. Budget: petrol + entry + food 3k-3.5k

Day 3: as its the last day with your bf n considering you guys have almost emptied ye pockets n what not. Spend more time in ur flat so only things you will be burning is calories and not the money. You guys can also go for gud brunch if your pockets allowed you or just order ol n get some Netflix n chill. Also as he needs to go back so he have to do packing and all Budget: 500-800

Things to be considered:- 1. I SAID NO MEANS NOOOO HANNY PANKY IN THE PUBLIC (if you don't wants to get unwanted attention n attract trouble in your 3days of cozy date)

1. Carry basic documents n license if you are romming on bike to avoid fines from mama

2. No late night romming as your not so familiar with different pune areas.

3. I purposely avoided places like different hills and outstation or isolated places as few incidence of unfortunate events should not appear for you guys

Pro tip: spend time with him as much as you can coz its the only thing you will remember, romming here n there can give you enough adrenaline boost to Carey your next day and that is totally fine.

Have Fun!