I have to disagree with Bishop. The Ivy recruiting is nothing like D3; nor is it like D1's who give athletic schollys.
My son plays baseball for an Ivy. All his OVs were fully paid for. We accompanied him but stayed off campus (we saw him minimally -- usually at a meeting in the coaches office [the hard sell], and at a team practice [he came nowhere near us; and they cannot work him out -- in fact, he was told not to bring his glove to the visit]. Since you are limited to 48 hours on campus, we generally all arrived the night before the OV began and stayed together at a local motel (the school probably would have picked that up if he asked) and the next morning he was picked up.
Some programs wanted more time with the parents; the program he chose ignored us except for a brief [hard sell] coaches meeting (about 30 minutes) at hour 47.5!
While the Ivy's do not have NLI's they have, for puposes of admissions, an analogous document (the "likely letter"). Unlike D3's, the LL removes the admissions uncertainty by informing the player that (absent some felony or similar serious transgression), he will be offered admissions when the decisions come out (April for regular decision; earlier for schools with Early Decision).
The LL is written by admissions; but, in the overwhelming majority of cases, the coaches (because they have done the admissions thing many hundreds of times) know who will pass admissions muster and can speak knowledgably about getting an LL issued to your son.
The Ivy's are in a real hurry at this time of year; the game of musical chairs really speeds up now. So, if you get an OV offer do not dawdle; decide whether you want to go to that school (and each school in the IVY League is very different from other Ivy schools). If the coach wants you, an offer will be given at or within days of the OV. Often the offer will have a very short fuse. Remember each Ivy brings in only 6 - 8 players a year. There is virtually no roster attrition, very few players are drafted following their junior year; and the rosters are limited to about 28. You will not have a chance to get multiple LL's -- each coach has between 6 - 8 per year and will not waste it on a player who may not come to the school.
Also, there are no athletic schollys, no merit aid; and the COA is around 53k. There are, however, grants to families -- including grants to middle class families which makes the IVY financial aid the best in the country. But regardless, it is still an expensive proposition.